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  • FDA approves vaccine...

FDA approves vaccine for use after known or suspected anthrax exposure

Written by savita thakur thakur Published On 2015-12-03T15:04:44+05:30  |  Updated On 3 Dec 2015 9:34 AM GMT
FDA approves vaccine for use after known or suspected anthrax exposure
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The U.S. Food and Drug Administration  approved a new indication for BioThrax (Anthrax Vaccine Adsorbed) to prevent disease following suspected or confirmed exposure to Bacillus anthracis, the bacterium that causes anthrax disease. The vaccine’s new use is approved for people 18 through 65 years of age in conjunction with recommended antibiotic treatment. BioThrax was initially approved by...

The U.S. Food and Drug Administration  approved a new indication for BioThrax (Anthrax Vaccine Adsorbed) to prevent disease following suspected or confirmed exposure to Bacillus anthracis, the bacterium that causes anthrax disease. The vaccine’s new use is approved for people 18 through 65 years of age in conjunction with recommended antibiotic treatment. BioThrax was initially approved by the FDA in 1970 for the prevention of anthrax disease in persons at high risk of exposure.

Anthrax disease, especially the inhalation form, is often fatal if not promptly treated. Anthrax is considered one of the more likely agents to be used in a biological attack, primarily because its spores are very stable and easy to disperse. Although it is rare, people may contract anthrax disease through natural exposures, such as contact with infected animals or contaminated animal products.

“With today’s approval of BioThrax, we now have a vaccine that can be used, together with antibiotic treatment, to prevent disease after exposure to anthrax spores,” said Karen Midthun, M.D., director of the FDA’s Center for Biologics Evaluation and Research.

BioThrax is the first vaccine to receive approval based on the Animal Rule. The Animal Rule allows animal efficacy data to be used as a basis for approval when human efficacy studies are not ethical or feasible.

Protective antibody levels, which were determined in rabbit and monkey studies, were used to predict efficacy in humans based on an assessment of the extent of antibody response achieved in human study participants. A 70 percent probability of survival in animal models from inhalational anthrax disease was deemed a reasonable level of protection and likely to provide reasonable benefit in humans.

The ability of BioThrax to increase the probability of survival after stopping post-exposure antibiotic treatment was assessed in rabbits. Rabbits treated with both antibiotics and BioThrax had a survival rate of 70 to 100 percent, depending on the vaccine dose administered. In contrast, in two studies of rabbits that received only antibiotic treatment, survival rates were 44 and 23 percent respectively.

The safety and antibody responses to BioThrax in humans were evaluated in a multi-center study conducted in the United States. Subcutaneous (under the skin) injections were given to 200 healthy adults in three doses at zero, two, and four weeks. The majority of study participants generated antibody responses that correlated to a 70 percent probability of survival that was observed in animal models.

The observed adverse reactions were comparable with those observed when BioThrax is used for pre-exposure disease prevention. The safety profile for BioThrax is well-established, with the majority of localized adverse events reported as tenderness, pain, swelling, and redness at the injection site, as well as limited movement of the injected arm. The most common systemic adverse reactions were muscle aches, headache, and fatigue.

BioThrax is manufactured by Emergent BioDefense Operations Lansing LLC, based in Lansing, Michigan.
anthrax Anthrax Vaccine Bacillus anthracis BioThrax Emergent BioDefense Operations Lansing The U.S. Food and Drug Administration USFDA 
savita thakur thakur
savita thakur thakur
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