Cat scratch disease (CSD) is a bacterial infection caused by Bartonella henselae, typically transmitted to humans through scratches or bites from cats, particularly kittens. The infection usually results in mild symptoms like swollen lymph nodes and resolves on its own, but it can lead to more serious complications in people with weakened immune systems.

The bacteria are spread through scratches or bites from infected cats, contact with cat saliva, or flea bites on cats. Certain groups are more at risk, including children, people with multiple cats, and those with compromised immune systems. Flea-infested cats are also more likely to carry the bacteria, increasing the risk for their owners.

Cat scratch disease is generally mild, but it's essential to seek medical advice if symptoms persist, especially for high-risk individuals. Preventive measures, such as avoiding rough play with cats and controlling fleas, can reduce the likelihood of infection.

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