Pet cats have bacterial infections. For example, cat-scratch disease is a disease caused by a cat scratching or biting it. The symptoms are swollen lymph nodes in the head, neck and upper limbs. Other symptoms include fever, headache, fatigue and loss of appetite. Cat-scratch disease is caused by Pattonella bacteria, which 40% of cats carry at some time in their lives. ​​​​​​

Toxoplasmosis, Toxoplasma gondii infection is very common but most people are asymptomatic and at most develop flu-like symptoms. However, if the immune function is low, or if a pregnant woman is infected, severe symptoms will occur, causing encephalitis and neurological diseases, and may also affect the heart, liver, inner ear, eyes, and occasionally death.

Hookworm disease, cat hookworm parasitizes in the small intestine of cats. Its larvae usually do not grow into adults after invading the human body, but they can cause itchy skin, and in severe cases, intestinal bleeding, inflammation and abdominal pain.

Salmonellosis is a disease caused by Salmonella bacteria, mainly diarrhea. Other symptoms include fever, stomachache, etc. It usually appears 1 to 3 days after infection and disappears within 1 week. If the diarrhea is severe or causes a blood infection, seek medical attention.