Anthrax vaccine and Anthrax vaccine adsorbed: Difference between pages

{{Short description|Vaccine}}

{{About|the US-licensed vaccine product|the US government program|Anthrax Vaccine Immunization Program}}

{{Use dmy dates|date=August 2023}}

{{cs1 config |name-list-style=vanc |display-authors=6}}

{{Infobox drug

| Verifiedfields = changed

| verifiedrevid = 447435589

| image = US Navy 030114-N-5027S-002 Preparing Anthrax vaccine aboard USS Saipan.jpg

| width =

| alt =

| caption =

<!-- data-->

| target = [[]]

| vaccine_type = subunit

<!--Clinical data-->

| tradename =

| Drugs.com = {{drugs.com|monograph|anthrax-immune-globulin-iv-human.html}}

| DailyMedID = Biothrax

| = <!-- A / / C / D / X -->

| pregnancy_AU_comment =

| pregnancy_category=

| routes_of_administration = [[Subcutaneous injection|Subcutaneous]], [[intramuscular]]

| legal_AU = <!-- S2, S3, S4, S5, S6, S7, S8, S9 or Unscheduled -->

| legal_CA = Rx-only

| legal_CA_comment = <ref>{{cite web | title=Summary Basis of Decision (SBD) for Biothrax | website=[[Health Canada]] | date=23 October 2014 | url=https://hpr-rps.hres.ca/reg-content/summary-basis-decision-detailTwo.php?linkID=SBD00435&lang=en | access-date=29 May 2022}}</ref><ref>{{cite web | title=Drug and medical device highlights 2018: Helping you maintain and improve your health | website=[[Health Canada]] | date=14 October 2020 | url=https://www.canada.ca/en/health-canada/services/publications/drugs-health-products/drug-medical-device-highlights-2018.html | access-date=17 April 2024}}</ref>

| legal_UK = <!-- GSL, P, POM, CD, or Class A, B, C -->

| legal_US = Rx-only

| legal_US_comment = <ref name="FDA Biothrax">{{cite web | title=Biothrax | website=U.S. Food and Drug Administration | date=6 July 2023 | url=https://www.fda.gov/vaccines-blood-biologics/vaccines/biothrax | access-date=25 August 2023}} {{PD-notice}}</ref><ref name="Biothrax FDA label">{{cite web | title=Biothrax- bacillus anthracis injection, suspension | website=DailyMed | date=15 November 2015 | url=https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=e0b11800-8922-11df-b3d7-0002a5d5c51b | access-date=27 August 2023}}</ref><ref name="FDA Cyfendus">{{cite web | title=Cyfendus | website=U.S. Food and Drug Administration | date=19 July 2023 | url=https://www.fda.gov/vaccines-blood-biologics/vaccines/cyfendus | access-date=25 August 2023}} {{PD-notice}}</ref><ref name="Cyfendus FDA label">https://www.fda.gov/media/170445/download</ref>

| legal_status =

<!-- Identifiers -->

| CAS_number_Ref = {{cascite|correct|??}}

| CAS_number =

| PubChem =

| DrugBank =

| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}

| ChemSpiderID = none

| UNII_Ref =

| UNII = 873OI62848

| synonyms = rPA102

<!--Chemical data-->

'''Anthrax vaccine adsorbed''', sold under the brand name '''Biothrax''' among others, is a [[vaccine]] intended to provide [[acquired immunity]] against ''[[Bacillus anthracis]]''.<ref name="FDA Biothrax" /><ref name="FDA Cyfendus" /><ref name="Biothrax FDA label" />

Anthrax vaccine adsorbed originated in studies done in the 1950s and was first licensed for use in humans in 1970. In the US, the principal purchasers of the vaccine are the [[United States Department of Defense|Department of Defense]] and [[Department of Health and Human Services]]. Ten million courses (60 million doses) of the vaccine have been purchased for the US [[Strategic National Stockpile]] in anticipation of the need for mass vaccinations owing to a future [[bio-terrorist]] anthrax attack. The product has attracted some controversy owing to alleged adverse events and questions as to whether it is effective against the inhalational form of anthrax.

== Medical uses ==

Anthrax vaccine adsorbed (Biothrax) is [[indicated]] for the active immunization for the prevention of disease caused by ''Bacillus anthracis'' in people aged 18 through 65 years of age.<ref name="Biothrax FDA label" /> It is approved for both pre-exposure prophylaxis of disease in persons at high risk of exposure and post-exposure prophylaxis of disease following suspected or confirmed ''Bacillus anthracis'' exposure, when administered in conjunction with recommended antibacterial drugs.<ref name="FDA Biothrax" /><ref name="Biothrax FDA label" />

Anthrax vaccine adsorbed, adjuvanted (Cyfendus) is indicated for post-exposure prophylaxis of disease following suspected or confirmed exposure to ''Bacillus anthracis'' in people aged 18 through 65 years of age when administered in conjunction with recommended antibacterial drugs.<ref name="FDA Cyfendus" />

==Description==

Anthrax vaccine adsorbed was developed by Emergent Biodefense Operations.

===Antigen===

Anthrax vaccine adsorbed is classified as a subunit vaccine that is cell-free and containing no whole or live anthrax bacteria.<ref name="biothrax">[https://www.fda.gov/cber/label/biopava0131022LB.pdf Biothrax Package Insert]</ref> The [[antigen]] (immunologically active) portions are produced from culture filtrates of a toxigenic, but avirulent, nonencapsulated mutant — known as V770-NP1-R — of the ''[[B. anthracis]]'' Vollum strain.<ref>{{cite journal |vauthors=Puziss M, Manning LC, Lynch JW | year = 1963 | title = Large-scale production of protective antigen of Bacillus anthracis in anaerobic cultures | journal = Appl Microbiol | volume = 11 | issue = 4| pages = 330–334 | doi = 10.1128/AEM.11.4.330-334.1963 | pmid = 13972634 | pmc = 1057997 |display-authors=etal| doi-access = free }}</ref> (The Vollum strain was the same one weaponized by the old [[U.S. biological warfare program]].) As with the [[Anthrax vaccines#Sterne's vaccine|Sterne (veterinary) anthrax vaccine strain]] and the similar British anthrax vaccine (known as [[Anthrax vaccines#British anthrax vaccines|AVP]]), anthrax vaccine adsorbed lacks the capsule plasmid pXO2 (required for full virulence) and is composed chiefly of the [[Anthrax toxin|anthrax protective antigen (PA)]]<ref>Leppla SH, Klimpel KR, Singh Y, et al (June 1996), "Interaction of anthrax toxin with mammalian cells", ''Salisbury Medical Bulletin'', Special Supplement #87, pg 91.</ref> with small amounts of edema factor (EF) and lethal factor (LF) that may vary from lot to lot. Other uncharacterized bacterial byproducts are also present. Whether or not the EF and LF contribute to the vaccine's efficacy is not known.<ref name="pmid10198799">{{cite journal | vauthors = Nass M | title = Anthrax vaccine. Model of a response to the biologic warfare threat | journal = Infectious Disease Clinics of North America | volume = 13 | issue = 1 | pages = 187–208, viii | date = March 1999 | pmid = 10198799 | doi = 10.1016/s0891-5520(05)70050-7 | url = http://www.vaccinationcouncil.org/2009/06/19/anthrax-vaccine-model-of-a-response-to-the-biologic-warfare-threat/ | access-date = 31 October 2012 | url-status = dead | archive-url = https://web.archive.org/web/20130109105142/http://www.vaccinationcouncil.org/2009/06/19/anthrax-vaccine-model-of-a-response-to-the-biologic-warfare-threat | archive-date = 9 January 2013 }}</ref> Anthrax vaccine adsorbed has smaller amounts of EF and LF than AVP.<ref name="pmid1771966">{{cite journal | vauthors = Turnbull PC | title = Anthrax vaccines: past, present and future | journal = Vaccine | volume = 9 | issue = 8 | pages = 533–9 | date = August 1991 | pmid = 1771966 | doi = 10.1016/0264-410x(91)90237-z }}</ref>

===Adjuvant===

Anthrax vaccine adsorbed contains [[aluminium hydroxide|aluminium hydroxide (alhydrogel)]] to adsorb PA as well as to serve as an [[Immunologic adjuvant|adjuvant]] (immune enhancer).<ref name="biothrax"/> As such it is believed to stimulate [[humoral immunity|humoral]], but not [[cell-mediated immunity|cell-mediated]], immunity.<ref name="pmid3148815">{{cite journal | vauthors = Welkos SL, Friedlander AM | title = Comparative safety and efficacy against Bacillus anthracis of protective antigen and live vaccines in mice | journal = Microbial Pathogenesis | volume = 5 | issue = 2 | pages = 127–39 | date = August 1988 | pmid = 3148815 | doi = 10.1016/0882-4010(88)90015-0 | url = https://zenodo.org/record/1258563 }}</ref> Each dose of the vaccine contains no more than 0.83&nbsp;mg aluminum per 0.5 mL dose. (This is near the allowed upper limit of 0.85&nbsp;mg/dose.<ref name="pmid12184360">{{cite journal | vauthors = Baylor NW, Egan W, Richman P | title = Aluminum salts in vaccines&mdash;US perspective | journal = Vaccine | volume = 20 | pages = S18-23 | date = May 2002 | issue = Suppl 3 | pmid = 12184360 | doi = 10.1016/S0264-410X(02)00166-4 }}</ref>) It also contains 0.0025% [[benzethonium chloride]] as a preservative and 0.0037% [[formaldehyde]] as a stabilizer.<ref name="biothrax"/> The mechanism of action of the adjuvant is not entirely understood.

===Potency/immunogenicity===

Vaccination of humans with anthrax vaccine adsorbed induces an immune response to PA. More than 1/3 of subjects develop detectable anti-PA IgG after a single inoculation; 95% do so after a 2nd injection; and 100% after 3 doses. The peak IgG response occurs after the 4th (6 month) dose. The potency of anthrax vaccine adsorbed vaccine lots is routinely determined both by the survival rates of parenterally challenged [[guinea pig]]s and their anti-PA antibody titres as measured by an [[enzyme linked immunosorbant assay]] (ELISA). The shelf-life of anthrax vaccine adsorbed is reported to be three years when stored between {{convert|2|and|8|C|F}} and never frozen.

==History==

===Initial research and development (1954–1970)===

The [[vaccine efficacy]] of anthrax vaccine adsorbed in humans was initially established by Philip S. Brachman of the [[United States Public Health Service]] (USPHS) in a [[controlled study]] undertaken between 1954 and 1959. The study field sites were four wool-sorting mills in the [[northeastern United States]] where employees were sometimes exposed to anthrax spores in the course of their work. Over the five years, 379 vaccinees were compared against 414 unvaccinated control subjects. There were 23 cases among controls (5 of them inhalation anthrax) compared with 3 cases among vaccinated (0 inhalation cases). The vaccine was judged to have a 92.5% vaccine efficacy against all types of anthrax experienced.<ref name="pmid18017912">{{cite journal | vauthors = Brachman PS, Gold H, Plotkin SA, Fekety FR, Werrin M, Ingraham NR | title = Field Evaluation of a Human Anthrax Vaccine | journal = American Journal of Public Health and the Nation's Health | volume = 52 | issue = 4 | pages = 632–45 | date = April 1962 | pmid = 18017912 | pmc = 1522900 | doi = 10.2105/ajph.52.4.632 }}</ref> Subsequently, there were no controlled clinical trials in humans of the efficacy of anthrax vaccine adsorbed<ref>Brachman PS and Friedlander AM (1994), "Anthrax", In: Plotkin SA and Mortimer EA (eds): ''Vaccines'', 2nd ed.; Philadelphia, WB Saunders, pg 729.</ref> due to the rarity of the condition (especially in the inhalational form) in humans and the ethical inadmissibility of conducting dangerous challenge studies in human subjects. Supportive animal challenge studies were done, however, showing that unvaccinated animals uniformly die whereas vaccinated animals are protected. About 95% of [[rhesus monkey]]s (62 of 65) survived challenge, as did 97% of rabbits (114 of 117). Guinea pigs (which are a poorer model for human anthrax than are monkeys or rabbits) showed a 22% protection (19 of 88).

===Licensure and limited occupational use (1970–1991)===

In 1970, anthrax vaccine adsorbed was first licensed by the USPHS for protection against [[cutaneous anthrax]] to a state-owned facility operated by the Michigan Department of Public Health. In 1973, the US [[Food and Drug Administration]] (FDA) first published standards for making, using and storing anthrax vaccine adsorbed.<ref>21 CFR Section 620.20.</ref> In the mid-1980s, the FDA approved it specifically for two limited preventive indications: 1) individuals who may come in contact with animal products or high-risk persons such as veterinarians and others handling potentially infected animals; and 2) individuals engaged in diagnostic or investigational activities involving anthrax spores. In 1985, the FDA published a Proposed Rule for a specific product review of the anthrax vaccine adsorbed, stating that the vaccine's "efficacy against inhalation anthrax is not well documented" (a statement quoted controversially many years later). For many years, anthrax vaccine adsorbed was a little known product considered to be safe for pre-exposure use in the US in at-risk veterinarians, laboratory workers, livestock handlers, and textile plant workers who process animal hair. In 1990, the State of Michigan changed the name of its original production plant facility to the Michigan Biologic Products Institute (MBPI) as it gave up state ownership and converted it to a private entity. The same year (as later revealed) MBPI changed both the fermenters and the filters used in manufacturing anthrax vaccine adsorbed without notifying the FDA, thus reportedly causing a 100 fold increase in the PA levels present in vaccine lots.{{citation needed|date=November 2012}}

Only several thousand people had ever received the vaccine up to 1991 when — coincident with [[Saddam Hussein]]'s invasion of [[Kuwait]] and the subsequent [[Gulf War]] — MBPI and the [[U.S. Army]] entered into an agreement for the manufacture of the vaccine. Later that year, the Army awarded MBPI the [[Commander's Award for Public Service]] for their efforts in supplying the US military with increased amounts of anthrax vaccine adsorbed for use during the conflict in which the use of anthrax bio-weapons by Iraq had been anticipated.

===Initial use in US military (1991–1997)===

Use of anthrax vaccine adsorbed expanded dramatically in 1991, when the US military, concerned that Iraq possessed anthrax bioweapons, administered it to some 150,000 service members deployed for the Gulf War. Hussein never deployed his bio-weapons, but subsequent confirmation of an [[Iraqi bioweapons program]] — including 8,500 liters of concentrated anthrax spores (6,500 liters of it filled into munitions) — came in 1995 and later when the Iraqi government began to fully disclose the scope and scale of the effort, which it had pursued since the 1980s.

Meanwhile, MBPI fell afoul of FDA inspectors and reviewers when it failed inspections (1993, 1997) and received warning letters (1995) and Notices of Intention to Revoke (1997) from the agency. At issue were a failure to validate the anthrax vaccine adsorbed manufacturing process to the FDA's satisfaction and various quality control failures, including reuse of expired vaccine, inadequate testing procedures, and use of lots that had failed testing. All of these developments vexed the Army, not only in its efforts to obtain sufficient vaccine for the troops, but in its desire to have anthrax vaccine adsorbed validated and fully licensed for prevention of inhalational anthrax, which is the expected weaponized form of the disease (as opposed to the cutaneous form for which the vaccine had been licensed in 1970). In 1995, the Army contracted with the [[Science Applications International Corporation]] (SAIC) to develop a plan to obtain FDA approval for a license amendment for anthrax vaccine adsorbed in order to add inhalational anthrax exposure to the product license thus enabling the manufacturer to list on the product license that the vaccine was effective against that form of the disease. The following year, MBPI submitted an "[[Investigational New Drug|IND application]]" to modify the product's license to add an indication for inhalation anthrax, thus formally establishing anthrax vaccine adsorbed as an "experimental" vaccine when used to prevent anthrax in the inhalational form.

In 1996, the US Department of Defense (DoD) sought and received permission from the FDA to begin vaccinations of all military personnel without obtaining a new licensed indication for anthrax vaccine adsorbed. It announced a plan the following year for the mandatory vaccination of all US service members. Under the plan all military personnel, including new recruits, would begin receiving what was then a six-shot series of inoculations in the following fashion: ''Phase 1'': Forces assigned now, or soon rotating, to high threat areas in Southwest Asia and Korea; ''Phase 2'': Early deploying forces into high threat areas; ''Phase 3'': Remainder of the force and new recruits; and ''Phase 4'': Continuation of the program with annual booster shots.

===The AVIP and initial mandatory military use (1997–2000)===

[[File:Defense.gov News Photo 990924-D-9880W-036.jpg|thumb|[[USAF]] [[flight surgeon]] Maj. Timothy Ballard (right) administers the final shot in the six-dose series of anthrax vaccine adsorbed to [[Chairman of the Joint Chiefs of Staff]] Gen. [[Henry Shelton]]]]

There were no published studies of anthrax vaccine adsorbed's safety in humans<ref>Brachman (1994), ''[[Op. cit.]]'', pg 729.</ref> until the advent of the [[Anthrax Vaccine Immunization Program]] (AVIP). This program, initiated by the [[Clinton administration]] and announced by [[United States Secretary of Defense|Secretary of Defense]] [[William Cohen]] in 1997, made the vaccine mandatory for active duty US service personnel. Vaccinations began in March 1998 with personnel sent to high-risk areas, such as [[South Korea]] and [[Southwest Asia]]. Also in 1998, MBPI was purchased by [[BioPort Corporation]] of [[Lansing, Michigan]] (jointly with former MBPI laboratory directors) for approximately $24 million. The same year, a particularly damning FDA report was issued resulting in the temporary suspension of anthrax vaccine adsorbed shipments from the production plant. Much controversy ensued due to the FDA infractions, the mandatory nature of the program, and to a public perception that anthrax vaccine adsorbed was unsafe — possibly causing sometimes serious side effects — and might be contributing to the highly politically charged malady known as "[[Gulf War syndrome]]". Hundreds of service members were compelled to leave the military (some of them [[court-martial]]ed) for resisting the inoculations during the first six years of the program.

Adverse events following anthrax vaccine adsorbed administration were assessed in several studies conducted by the DoD in the context of the routine anthrax vaccination program. Between 1998 and 2000, at [[U.S. Forces, Korea]], data were collected at the time of anthrax vaccination from 4,348 service personnel regarding adverse events experienced from a previous dose of anthrax vaccine. Most reported events were localized, minor, and self-limited. After the first or second dose, 1.9% reported limitations in work performance or had been placed on limited duty. Only 0.3% reported >1 day lost from work; 0.5% consulted a clinic for evaluation; and one person (0.02%) required hospitalization for an [[injection site reaction]]. Adverse events were reported more commonly among women than among men. A second study, also between 1998 and 2000, at [[Tripler Army Medical Center]], [[Hawaii]], assessed adverse events among 603 military health-care workers. Rates of events that resulted in seeking medical advice or taking time off work were 7.9% after the first dose; 5.1% after the second dose; 3.0% after the third dose; and 3.1% after the fourth dose. Events most commonly reported included muscle or joint aches, headache, and fatigue. However, these studies are subject to several methodological limitations, including sample size, the limited ability to detect adverse events, loss to follow-up, exemption of vaccine recipients with previous adverse events, observational bias, and the absence of unvaccinated control groups.<ref name="pmid10817479">{{cite journal | title = Surveillance for adverse events associated with anthrax vaccination--U.S. Department of Defense, 1998-2000 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 49 | issue = 16 | pages = 341–5 | date = April 2000 | pmid = 10817479 | author1 = Centers for Disease Control Prevention (CDC) }}</ref>

By 2000, some 425,976 US service members had received 1,620,793 doses of anthrax vaccine adsorbed.

===The IOM review (2000–2004)===

In October 2000, a committee of the [[Institute of Medicine]] (IOM) of the [[National Academy of Sciences]] was asked by the [[US Congress]] to review anthrax vaccine adsorbed according to the best available evidence. It issued its study in March 2002. The IOM panel noted that human data on inhalational anthrax prevention is limited due to the natural low incidence of disease and that therefore animal model data are the best we are ever likely to have. Primates and rabbits were considered the best models for human disease. As regards vaccine effectiveness, "The committee finds that the available evidence from studies with humans and animals, coupled with reasonable assumptions of analogy, show that anthrax vaccine adsorbed as licensed is an effective vaccine for the protection of humans against anthrax, including inhalational anthrax, caused by all known or plausible engineered strains of ''B. anthracis''." With regard to safety, "The committee found no evidence that people face an increased risk of experiencing life-threatening or permanently disabling adverse events immediately after receiving anthrax vaccine adsorbed, when compared with the general population. Nor did it find any convincing evidence that people face elevated risk of developing adverse health effects over the longer term, although data are limited in this regard (as they are for all vaccines)." Side effects of anthrax vaccine adsorbed were found to be "comparable to those observed with other vaccines regularly administered to adults". The committee concluded that anthrax vaccine adsorbed is "safe and efficacious" for pre-exposure prevention of inhalational anthrax. It also asserted that a new and improved anthrax vaccine might have greater assurance of consistency than anthrax vaccine adsorbed and recommended licensure of a new vaccine requiring fewer doses and producing fewer local reactions.<ref name="doi10.17226/10310">{{cite book |vauthors = Joellenbeck LM, Zwanziger LL, Durch JS, Strom BL |title=The Anthrax Vaccine: Is It Safe? Does It Work? |date = April 2002 |publisher=National Academies Press |pmid=25057597 |doi= 10.17226/10310 |isbn=978-0-309-08309-6 |s2cid=78028756 |url = https://nap.nationalacademies.org/catalog/10310/the-anthrax-vaccine-is-it-safe-does-it-work}}</ref>

In the months after the [[AMERITHRAX|October 2001 anthrax letters attacks]], Washington and New York area mail sorters were advised to receive prophylactic vaccination with anthrax vaccine adsorbed. Owing to the controversy surrounding the administration of the vaccine to military personnel, however, some 6,000 [[US Postal Service]] employees balked at this, preferring to take their chances with the risks of residual anthrax spores in the workplace.<ref>Allen, Arthur (2007), ''Vaccine: The Controversial Story of Medicine's Greatest Lifesaver''; [[W.W. Norton & Co.]], pp 13-14.</ref>

BioPort changed its name to [[Emergent BioSolutions]] in 2004.

===Injunctions and FDA re-reviews (2004–2006)===

Despite the positive IOM assessment, mandatory vaccinations of military personnel were halted due to an injunction which was put into place on 27 October 2004. The injunction cast questions about numerous substantive challenges regarding the anthrax vaccine in footnote #10,<ref>{{cite web|url=http://www.anthrax.mil/documents/library/AnthraxSJtOrder_Op.pdf |title=John Doe #1 v. Donald H. Rumsfeld, et al |date=27 October 2004 |publisher=Military Vaccine (MILVAX) Agency |access-date=6 May 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090825005302/http://www.anthrax.mil/documents/library/AnthraxSJtOrder_Op.pdf |archive-date=25 August 2009 }}</ref> yet the procedural findings centered on FDA procedural issues, stating that additional public comment should have been sought before the FDA issued its Final Rule declaring the vaccine safe and effective on 30 December 2003.<ref>''[[Federal Register]]'', 5 January 2006, vol 69: pp 255-67.</ref> The FDA's incomplete rulemaking from 1985 effectively rendered the anthrax vaccine program illegal. The basis was the never finalized FDA Proposed Rule. In that rulemaking the FDA published, but never finalized, a licensing rule for the anthrax vaccine in the Federal Register, which included an expert review panel's findings. Those findings included the fact that the "Anthrax vaccine efficacy against inhalation anthrax is not well documented," and that "No meaningful assessment of its value against inhalation anthrax is possible due to its low incidence," and that "The vaccine manufactured by the Michigan Department of Public Health has not been employed in a controlled field trial."<ref>{{cite web |url=http://www.anthrax.mil/documents/library/fed_reg.pdf |title=50 FR 51002 published on Dec. 13, 1985 |access-date=29 October 2012 |archive-url=https://web.archive.org/web/20120303225724/http://www.anthrax.mil/documents/library/fed_reg.pdf |archive-date=3 March 2012 |url-status=dead }}</ref>

On 15 December 2005, the FDA re-issued a Final Rule & Order on the license status of the anthrax vaccine.<ref name="final order">[http://www.bt.cdc.gov/agent/anthrax/needtoknow.asp FDA Final Order.] {{webarchive |url=https://web.archive.org/web/20121102002023/http://www.bt.cdc.gov/agent/anthrax/needtoknow.asp |date=2 November 2012 }} Issued 15 December 2005.</ref> After reviewing the extensive scientific evidence and carefully considering comments from the public, the FDA again determined that the vaccine is appropriately licensed for the prevention of anthrax, regardless of the route of exposure. Also in 2005, the [[George W. Bush]] administration established a policy to ensure that the [[Strategic National Stockpile]] retains a current unexpired inventory of 60 million doses of anthrax vaccine adsorbed. (The US [[GAO]] reports that 4 million doses of the inventory will expire every year, requiring vaccine destruction services.) These would be used for pre- or post-exposure vaccination — of emergency first responders (police, firefighters), federal responders, medical practitioners, and private citizens — in the event of a [[bioterrorist]] anthrax attack.

===Reinstatement of the AVIP (2006–2016)===

On 16 October 2006, the DoD announced the reinstatement of mandatory anthrax vaccinations for more than 200,000 troops and defense contractors. (Another lawsuit was filed by the same attorneys as before, challenging the basis of the vaccine's license on scientific grounds.) The reinstated policy required vaccinations for most military units and civilian contractors assigned to homeland bioterrorism defense or deployed in [[Iraq]], [[Afghanistan]] or [[South Korea]].<ref>[https://www.washingtonpost.com/wp-dyn/content/article/2006/10/16/AR2006101601084_pf.html Mandatory Vaccine Article] - 'Mandatory Anthrax Shots to Return', Christopher Lee, Washington Post (17 October 2006)</ref> A modification of previous policy allowed military personnel no longer deployed to higher threat areas to receive follow up doses and booster shots on a voluntary basis. As of June 2008, over 8 million doses of anthrax vaccine adsorbed had been administered to over 2 million US military personnel as part of the AVIP.

In December 2008, the FDA approved Biothrax for intramuscular injections thus reducing the immunization schedule from a total of 6 shots to 5 shots (see below).

In February 2009, Emergent BioSolutions announced that the [[Drugs Controller General of India]] (DGCI) had approved licensing of Biothrax for distribution by Biological E. of [[Hyderabad, India|Hyderabad]].<ref>{{cite press release | url=https://investors.emergentbiosolutions.com/news-releases/news-release-details/emergent-biosolutions-announces-biothrax-anthrax-vaccine | title=Emergent BioSolutions Announces That Biothrax (Anthrax Vaccine Adsorbed) Receives Market Authorization in India | date=12 February 2009}}</ref>

In 2011, Biothrax was approved for sale in [[Singapore]] by the Singapore Health Sciences Authority.<ref>{{cite news |title=Emergent gets entry to Singapore |first=Jeff |last=Clabaugh |url=http://www.bizjournals.com/washington/news/2011/06/24/emergent-gets-entry-to-singapore.html |newspaper=Washington Business Journal |date=24 June 2011 |access-date=22 July 2011}}</ref>

=== Building 55 approval (2016) ===

The FDA approved the company's license (officially called a supplemental [[Biologic license application|Biologics License Application]], or sBLA) to manufacture Biothrax in a large building in Lansing, Michigan known as "Building 55." According to ''Homeland Preparedness News'', "The use of Building 55 to manufacture Biothrax could expand manufacturing capacity to an estimated 20 to 25 million doses annually."<ref name=":0">{{cite web|url=https://homelandprepnews.com/biological-threats/19502-fda-approves-sbla-biothrax-manufacture-emergent-biosolutions-building-55/|title=FDA approves sBLA for Biothrax manufacture at Emergent BioSolutions' Building 55 |date=16 August 2016|website=Homeland Preparedness News|access-date=23 August 2016}}</ref>

The US federal government has a goal to stockpile 75 million doses of anthrax vaccines. The new facility and its capacity will help Emergent meet the government's security needs.<ref name=":0" />

Emergent worked with the [[Biomedical Advanced Research and Development Authority]] (BARDA) within the [[Office of the Assistant Secretary for Preparedness and Response]] in the [[United States Department of Health and Human Services]] on the project. The facility's value is estimated at $104 million, according to Yahoo Finance.<ref>{{cite web|url=https://finance.yahoo.com/news/emergent-biosolutions-receives-fda-approval-202000125.html|title=Emergent BioSolutions Receives FDA Approval for Large-Scale Manufacturing of Biothrax in Building 55 |date=15 August 2016|website=Yahoo Finance|access-date=23 August 2016}}</ref>

==Administration==

===Vaccination schedule===

The loss of memory B-Cells leads to declining concentrations of IgG which can sequester APA, and therefore declining tolerance to the presence of anthrax bacteria. There is the potential that other memory B-Cell populations will be adversely affected as well.{{Citation needed|date=November 2015}}

Furin is the protein activator for pro-[[parathyroid hormone]], [[TGFB1|transforming growth factor beta 1]], [[von Willebrand factor]], pro-[[albumin]], pro-[[beta-secretase 1|beta-secretase]], [[MMP1|membrane type-1 matrix metalloproteinase]], [[gonadotropin]], and [[nerve growth factor]]. Furin is also essential to maintain peripheral immune tolerance by creating memory T-cells and suppressor T-cells.<ref name="pmid18701887">{{cite journal | vauthors = Pesu M, Watford WT, Wei L, Xu L, Fuss I, Strober W, Andersson J, Shevach EM, Quezado M, Bouladoux N, Roebroek A, Belkaid Y, Creemers J, O'Shea JJ | title = T-cell-expressed proprotein convertase furin is essential for maintenance of peripheral immune tolerance | journal = Nature | volume = 455 | issue = 7210 | pages = 246–50 | date = September 2008 | pmid = 18701887 | pmc = 2758057 | doi = 10.1038/nature07210 | bibcode = 2008Natur.455..246P }}</ref>

Based on a retrospective cohort study of female military members inoculated during pregnancy, there may be a small risk of birth defect for inoculation during first trimester. However, the difference between the vaccinated and unvaccinated control groups was not large enough to be conclusive.<ref name="pmid18599489">{{cite journal | vauthors = Ryan MA, Smith TC, Sevick CJ, Honner WK, Loach RA, Moore CA, Erickson JD | title = Birth defects among infants born to women who received anthrax vaccine in pregnancy | journal = American Journal of Epidemiology | volume = 168 | issue = 4 | pages = 434–42 | date = August 2008 | pmid = 18599489 | doi = 10.1093/aje/kwn159 | doi-access = free }}</ref>

The approved US FDA package insert for Biothrax contains the following notice:

{{blockquote|Pregnant women should not be vaccinated against anthrax unless the potential benefits of vaccination have been determined to outweigh the potential risk to the fetus. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this product, the patient should be apprised of the potential hazard to the fetus.<ref name="biothrax2008">[https://www.fda.gov/cber/products/biothrax.htm US FDA, Center for Biologics Evaluation and Research CBER, Product Approval Information for Anthrax Vaccine Adsorbed] (December 2008)</ref>}}

===Contraindications===

The approved US FDA package insert for Biothrax contains the following notice:

{{blockquote|

* Severe allergic reaction (e.g., anaphylaxis) after a previous dose of Biothrax.

* Administer with caution to patients with a possible history of latex sensitivity because the vial stopper contains dry natural rubber and may cause allergic reactions.<ref name="biothrax2008"/>

}}

===Adverse reactions===

There have been no long-term [[sequela]]e of the known adverse events (local or systemic reactions) and no pattern of frequently reported serious adverse events for anthrax vaccine adsorbed.<ref name="pmid10817479" />

The approved FDA package insert for anthrax vaccine adsorbed contains the following notice: "The most common (>10%) local (injection-site) adverse reactions observed in clinical studies were tenderness, pain, [[erythema]] and arm motion limitation. The most common (>5%) systemic adverse reactions were muscle aches, fatigue and headache." Also, "Serious allergic reactions, including [[anaphylactic shock]], have been observed during post-marketing surveillance in individuals receiving Biothrax".<ref name="biothrax2008"/>

===Drug interactions===

The approved US FDA package insert for anthrax vaccine adsorbed contains the following notice:

.<ref name="biothrax2008"/>

===Post-exposure vaccination===

Some studies show that use of antibiotics effective against anthrax ''plus'' administration of anthrax vaccine adsorbed is the most beneficial approach for purposes of [[post-exposure prophylaxis]]. This practice has been endorsed by the [[Advisory Committee on Immunization Practices]] (ACIP), the Johns Hopkins Working Group on Civilian Biodefense, and the 2002 Institute of Medicine report on the vaccine. However, anthrax vaccine adsorbed is not licensed for post-exposure prophylaxis for inhalational anthrax or for use in a 3-dose regimen. Any such use, therefore, would be on an [[off-label]] or [[Investigational New Drug|IND]] (officially experimental) basis. "...&nbsp;the safety and efficacy of Biothrax for post-exposure setting have not been established.".<ref name="biothrax2008"/>

== Society and culture ==

=== Controversy ===

===In the United States===

Although many individuals have expressed health concerns after receiving anthrax vaccine, a congressionally directed study by the [[Institute of Medicine]] (part of the [[United States National Academy of Sciences|National Academy of Sciences]]) concluded that this anthrax vaccine is as safe as other vaccines. The academy considered more than a dozen studies using various scientific designs, and heard personally from many concerned US military service members.<ref name="doi10.17226/10310" />

=== Development of a replacement vaccine ===

While effective in protecting against anthrax, the licensed vaccine schedule is not very efficient, involving a cumbersome five (previously six) dose injection series. Typically, five injections are given over a period of 18 months in order to induce a protective immune system response. In addition, in 2004 the US Department of Health and Human Services contracted with [[Vaxgen]] Inc. to supply up to 75 million doses of a [[Recombinant DNA|recombinant]] anthrax vaccine, for $877 million.<ref>[http://www.vaxgen.com/anthrax.html Vaxgen anthrax vaccine contract information.] {{webarchive |url=https://web.archive.org/web/20061231215240/http://www.vaxgen.com/anthrax.html |date=31 December 2006 }}</ref> To be acceptable to HHS, this vaccine was to be protective against anthrax in three doses or less. On 19 December 2006, HHS voided the contract, because of stability problems with the vaccine, and a failure to start a Phase 2 clinical trial on time.<ref>{{cite news | last=Heavey | first=Susan | title=U.S. cancels VaxGen anthrax vaccine contract | newspaper=[[The Washington Post]] | date=20 December 2006 | url=https://www.washingtonpost.com/wp-dyn/content/article/2006/12/20/AR2006122001123.html | access-date=25 January 2020}}</ref> In May 2008, Emergent Biosolutions, the Maryland-based successor to BioPort, both controlled by former Lebanese banker Faud el Hibri, acquired rights to Vaxgen's patents and processes.<ref>{{cite web | url = https://www.forbes.com/feeds/afx/2008/05/05/afx4967820.html | archive-url = https://web.archive.org/web/20090209115928/http://www.forbes.com/feeds/afx/2008/05/05/afx4967820.html | url-status = dead | archive-date = 9 February 2009 | title = VaxGen sells anthrax vaccine candidate to Emergent BioSolutions | work = Forbes Magazine | date = 2008 }}</ref>

In October 2012, the US [[National Institute of Allergy and Infectious Diseases]] agreed to provide $6.5 million to the United Kingdom's [[Health Protection Agency]] for initial work on a potential future anthrax vaccine that could be delivered through the nasal passage instead of via a needle. The HPA has long produced the UK's [[Anthrax vaccines#British anthrax vaccines|AVP anthrax vaccine]].

Research is being continuously done to develop and test new improved candidate anthrax vaccines.<ref name="pmid15467819">{{cite journal | vauthors = Goodman L | title = Taking the sting out of the anthrax vaccine | journal = The Journal of Clinical Investigation | volume = 114 | issue = 7 | pages = 868–9 | date = October 2004 | pmid = 15467819 | pmc = 518679 | doi = 10.1172/JCI23259 }}</ref><ref>{{cite book | vauthors = Friedlander AM, Grabenstein JD, Brachman PS | chapter = Anthrax vaccines|date=1 January 2013 | title = Vaccines | edition = Sixth |pages=127–140| veditors = Plotkin SA, Orenstein WA, Offit PA | place = London|publisher=W.B. Saunders |doi=10.1016/b978-1-4557-0090-5.00022-7|isbn=978-1-4557-0090-5 }}</ref><ref name=":1">{{cite journal | vauthors = Manish M, Verma S, Kandari D, Kulshreshtha P, Singh S, Bhatnagar R | title = Anthrax prevention through vaccine and post-exposure therapy | journal = Expert Opinion on Biological Therapy | pages = 1405–1425 | date = August 2020 | volume = 20 | issue = 12 | pmid = 32729741 | doi = 10.1080/14712598.2020.1801626 | s2cid = 220877509 }}</ref> The primary immunogen of acellular existing vaccines, i.e., Protective Antigen (PA), is highly thermolabile due to inherent structural and chemical instability.<ref>{{cite journal | vauthors = Singh S, Singh A, Aziz MA, Waheed SM, Bhat R, Bhatnagar R | title = Thermal inactivation of protective antigen of Bacillus anthracis and its prevention by polyol osmolytes | journal = Biochemical and Biophysical Research Communications | volume = 322 | issue = 3 | pages = 1029–37 | date = September 2004 | pmid = 15336568 | doi = 10.1016/j.bbrc.2004.08.020 }}</ref><ref>{{cite journal | vauthors = Powell BS, Enama JT, Ribot WJ, Webster W, Little S, Hoover T, Adamovicz JJ, Andrews GP | title = Multiple asparagine deamidation of Bacillus anthracis protective antigen causes charge isoforms whose complexity correlates with reduced biological activity | journal = Proteins | volume = 68 | issue = 2 | pages = 458–79 | date = August 2007 | pmid = 17469195 | doi = 10.1002/prot.21432 | s2cid = 21178350 | doi-access = free }}</ref><ref>{{cite journal | vauthors = Singh S, Ahuja N, Chauhan V, Rajasekaran E, Mohsin Waheed S, Bhat R, Bhatnagar R | title = Gln277 and Phe554 residues are involved in thermal inactivation of protective antigen of Bacillus anthracis | journal = Biochemical and Biophysical Research Communications | volume = 296 | issue = 5 | pages = 1058–62 | date = September 2002 | pmid = 12207879 | doi = 10.1016/s0006-291x(02)02049-1 }}</ref><ref>{{cite journal | vauthors = D'Souza AJ, Mar KD, Huang J, Majumdar S, Ford BM, Dyas B, Ulrich RG, Sullivan VJ | title = Rapid deamidation of recombinant protective antigen when adsorbed on aluminum hydroxide gel correlates with reduced potency of vaccine | journal = Journal of Pharmaceutical Sciences | volume = 102 | issue = 2 | pages = 454–61 | date = February 2013 | pmid = 23242822 | doi = 10.1002/jps.23422 | doi-access = free }}</ref> Various endeavors are underway to thermostabilize PA molecule by solvent engineering and genetic engineering approaches to generate a thermostable anthrax vaccine formulation without compromising on the immunogenicity and its protective potential.<ref name=":1" /> The generation of a thermostable anthrax vaccine would minimize the current cold chain requirement for its storage and transport. Anthrax vaccines which would be amenable to other modes of administration such as oral, nasal, skin patch etc., are also being experimented.

Human Genome Sciences announced in 2007, the development of a new anthrax neutralizing monoclonal antibody with the trademark name of 'ABthrax'. The vaccine sensitizes the human immune system to the presence of the Anthrax Toxin Factor. In 2008, HGS reported on testing on 400 human volunteers given ABthrax. In 2009, HGS announced that they had made first delivery of 20,000 doses of ABthrax to the United States Department of Defense.<ref>[http://www.gazette.net/stories/02062009/businew172026_32486.shtml BioWatch: HGS shipping anthrax treatment in $150M deal] {{Webarchive|url=https://web.archive.org/web/20110522191338/http://www.gazette.net/stories/02062009/businew172026_32486.shtml |date=22 May 2011 }} Gazette.Net - Maryland Community Newspapers Online</ref> Currently three anthrax antitoxin antibodies, namely, Anthrax immune globulin intravenous or 'AIGIV' (polyclonal), 'Obiltoxaximab' or 'ANTHIM' (monoclonal), and 'Raxibacumab' or 'ABthrax' (monoclonal) are approved for the treatment of inhalation anthrax.<ref>{{cite journal | vauthors = Bower WA, Schiffer J, Atmar RL, Keitel WA, Friedlander AM, Liu L, Yu Y, Stephens DS, Quinn CP, Hendricks K | title = Use of Anthrax Vaccine in the United States: Recommendations of the Advisory Committee on Immunization Practices, 2019 | journal = MMWR. Recommendations and Reports | volume = 68 | issue = 4 | pages = 1–14 | date = December 2019 | pmid = 31834290 | doi = 10.15585/mmwr.rr6804a1 | doi-access = free | pmc = 6918956 | url = <!-- Official url --> https://www.cdc.gov/mmwr/volumes/68/rr/pdfs/rr6804a1-H.pdf }}</ref>

== References ==

{{reflist}}

== Further reading ==

{{refbegin}}

* {{cite journal | vauthors = Donegan S, Bellamy R, Gamble CL | title = Vaccines for preventing anthrax | journal = The Cochrane Database of Systematic Reviews | issue = 2 | pages = CD006403 | date = April 2009 | volume = 2009 | pmid = 19370633 | pmc = 6532564 | doi = 10.1002/14651858.CD006403.pub2 }}

* {{cite journal | last=Borio | first=Luciana L. | title=The Second Generation Anthrax Vaccine Candidate: rPA102 | journal=Clinicians' Biosecurity News | date=July 2005 | url=http://www.centerforhealthsecurity.org/cbn/2005/cbnTOPICS_071305.html | access-date=26 January 2020 | archive-date=26 January 2020 | archive-url=https://web.archive.org/web/20200126051159/http://www.centerforhealthsecurity.org/cbn/2005/cbnTOPICS_071305.html | url-status=dead }}

{{refend}}

== External links ==

* {{cite web | title=Anthrax Vaccine Information Statement | website=U.S. [[Centers for Disease Control and Prevention]] (CDC) | date=8 January 2020 | url=https://www.cdc.gov/vaccines/hcp/vis/vis-statements/anthrax.html }}

* {{MeshName|Anthrax Vaccines}}

{{Portal bar | Medicine}}

:Anthrax

[[Category:Subunit vaccines]]