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Postexposure prophylaxis against experimental inhalation anthrax

A M Friedlander1, S L Welkos, M L Pitt

  • 1US Army Medical Research Institute of Infectious Diseases, Bacteriology Division, Frederick, MD 21702-5011.

The Journal of Infectious Diseases
|May 1, 1993
PubMed
Summary
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Postexposure antibiotics, including penicillin, ciprofloxacin, and doxycycline, significantly protected monkeys against lethal inhalation anthrax. Combining antibiotics with vaccination offered long-term protection, even after drug discontinuation.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Inhalation anthrax, caused by Bacillus anthracis, is a rare but nearly always fatal disease.
  • Effective postexposure prophylaxis strategies are crucial for managing anthrax incidents.

Purpose of the Study:

  • To evaluate the efficacy of prolonged postexposure antibiotic treatment, with or without vaccination, against lethal inhalation anthrax in a non-human primate model.
  • To determine if antibiotic therapy provides long-term protection after drug discontinuation.

Main Methods:

  • Monkeys were exposed to a lethal aerosol dose of Bacillus anthracis.
  • Groups received penicillin, ciprofloxacin, doxycycline, doxycycline plus vaccination, vaccination alone, or saline for 30 days.
  • Vaccination was administered on days 1 and 15.

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  • Animals were monitored for survival and protection against rechallenge.

    • Main Results:

    • All antibiotic regimens provided complete protection during treatment.
    • Significant long-term protection was observed after antibiotic discontinuation: penicillin (7/10), ciprofloxacin (8/9), doxycycline (9/10), and doxycycline plus vaccination (9/9).
    • Control and vaccination-alone groups showed high mortality rates (9/10 and 8/10, respectively).
    • Combined postexposure antibiotic treatment and vaccination conferred protection against rechallenge.

    Conclusions:

    • Prolonged postexposure antibiotic therapy is highly effective in preventing death from inhalation anthrax.
    • Antibiotics combined with vaccination provide robust and lasting protection, even after therapy cessation.
    • This regimen holds promise for anthrax postexposure prophylaxis.