Final answer:
Bartonella henselae bacteria causes cat-scratch fever, which is a bacterial infection transmitted through bites or scratches from infected cats. A scratch on the face can introduce the bacteria into the wound, resulting in symptoms such as pus formation, swollen lymph nodes, and fever.
Step-by-step explanation:
The bacteria that causes cat-scratch fever is Bartonella henselae, a facultative intracellular gram-negative bacterium. Cat-scratch fever is a bacterial infection that can be transmitted to humans through bites or scratches from infected cats. When a scratch occurs on the face, it can result in the introduction of B. henselae bacteria into the wound, leading to an infection characterized by a small nodule with pus formation, swelling and pain in the nearby lymph nodes, and symptoms such as fever, chills, and fatigue. It is important to clean a cat scratch with soap and warm water to prevent this infection.