When should I worry about a cat scratch? Here's what experts say.

Cat scratch disease, also called cat scratch fever, occurs when someone comes into contact with Bartonella henselae bacteria.

Cats typically get this infection when they are infected by fleas.

Kittens are more likely to be infected with and pass along CSD , but stray cats are more prone to it.

A person with CSD may also have a fever, headache, poor appetite and exhaustion.

The infected area may appear swollen and red with round, raised lesions and can have pus.

Rarely, CSD can affect the brain, eyes, heart or other internal organs.