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Infect. Immun., 12 1997, 5171-5175, Vol 65, No. 12
Copyright © 1997, American Society for Microbiology

Passive protection by polyclonal antibodies against Bacillus anthracis infection in guinea pigs

SF Little, BE Ivins, PF Fellows and AM Friedlander
Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland 21702-5011, USA.

The protective effects of polyclonal antisera produced by injecting guinea pigs with protective antigen (PA), the chemical anthrax vaccine AVA, or Sterne spore vaccine, as well as those of toxin-neutralizing monoclonal antibodies (MAbs) produced against PA, lethal factor, and edema factor, were examined in animals infected with Bacillus anthracis spores. Only the anti-PA polyclonal serum significantly protected the guinea pigs from death, with 67% of infected animals surviving. Although none of the MAbs was protective, one PA MAb caused a significant delay in time to death. Our findings demonstrate that antibodies produced against only PA can provide passive protection against anthrax infection in guinea pigs.

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