## **Core Concept**
Pasteurella multocida is a type of bacteria commonly associated with animal bites. It is a gram-negative, facultative anaerobic coccobacillus. This bacterium is part of the normal flora in the oral cavity of many animals, including dogs, cats, and rodents.

## **Why the Correct Answer is Right**
The correct answer, , implies transmission by animal bites. Pasteurella multocida is indeed primarily transmitted through bites from infected animals, most commonly dogs and cats. The bacteria colonize the oral cavity of these animals and are introduced into the wound during a bite, leading to infection in humans.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify a mode of transmission relevant to Pasteurella multocida.
- **Option B:** This option is incorrect as it does not relate to the known transmission methods of Pasteurella multocida.
- **Option C:** This option is incorrect because, while it might imply a vector or a mode of transmission, it is not accurate for Pasteurella multocida, which is primarily associated with direct contact through animal bites.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that Pasteurella multocida infections are often associated with animal bites, particularly from cats and dogs. These infections can lead to severe cellulitis, abscesses, and, rarely, systemic infections. Prompt antibiotic treatment is usually recommended for prophylaxis after an animal bite to prevent infection.

## **Correct Answer:** . Animal bites