## Core Concept
Pasteurella multocida is a Gram-negative, facultative anaerobic bacterium commonly found in animals. It is a causative agent of various diseases in animals and occasionally in humans. The mode of infection typically involves direct contact with infected animals.

## Why the Correct Answer is Right
The correct answer, , implies that the mode of infection of Pasteurella multocida is through direct contact or bite wounds from infected animals. This bacterium is commonly found in the oral cavity of animals such as dogs, cats, and birds. When these animals bite or scratch, they can transmit the bacteria directly into the wound. This direct inoculation of bacteria into tissues is a classic example of a zoonotic infection, where the pathogen is transmitted from animals to humans.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately describe the mode of infection for Pasteurella multocida. Without the specific details of option A, we can infer that any option not involving direct contact or animal bites would be incorrect.
- **Option B:** Similarly, this option is incorrect if it suggests an indirect mode of infection, such as airborne or waterborne transmission, which is not characteristic of Pasteurella multocida infections.
- **Option C:** This option is presumably incorrect based on the context that is the correct answer, implying involves a mechanism other than direct contact or animal bites.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Pasteurella multocida infections are often associated with animal bites. Patients presenting with cellulitis or abscesses following an animal bite should be suspected of having a Pasteurella multocida infection. Early recognition and appropriate antibiotic treatment are crucial to prevent complications.

## Correct Answer: .