What is the most common bacterium associated with dog bites?

The most common bacterium associated with dog bites is Pasteurella multocida. This gram-negative bacterium is part of the normal oral flora of dogs and cats, and it can cause wound infections when transmitted through bites.

While Capnocytophaga canimorsus, which is closely associated with dog and cat bites, can cause serious infections, it is less frequently identified as the most common pathogen. Pasteurella multocida is more prevalent in clinical settings, and its presence in mixed infection cases further supports its standing as the primary pathogen in bites, particularly those from dogs.

Staphylococcus aureus and Escherichia coli are also potential pathogens that may be involved in bite wound infections, but they are not as strongly associated with dog bites specifically. Staphylococcus aureus is more common in skin flora, and Escherichia coli is typically associated with gastrointestinal flora rather than animal bites.

Understanding the microbiology of bite wounds is essential for appropriate management and antibiotic therapy. In cases of dog bites, immediate care often involves thorough washing of the wound and possible prophylactic antibiotic treatment directed toward Pasteurella multocida to prevent infection.