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Although the incidence of infection secondary to the bites of venomous snakes remains unknown, the routine use of prophylactic antimicrobial therapy is advocated. In this study, the venom from 15 rattlesnakes was cultured, and 58 aerobic and 28 anaerobic strains of bacteria were isolated. The most common species isolated were Pseudomonas aeruginosa, Proteus species, coagulase-negative staphylocci, and Clostridium species. Bacteroides fragilis was also recovered. When the fang sheaths of four additional rattlesnakes were retracted and the fangs of these snakes decontaminated, 50% of the samples of venom had no bacterial growth (P = 0.035). Until a clinical study is performed, the use of antimicrobial therapy that reflects that complex oral flora of rattlesnakes is still recommended in most cases of envenomization.

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