Symptoms of Cat Scratch Disease (CSD)
Your doctor will perform a physical examination on you to diagnose signs of a large spleen. For an accurate diagnosis, the doctor may ask you to undergo an indirect fluorescent antibody (IFA) blood test. This will give them a clear picture of bacterial infection in your body.

The doctor may require a complete history to learn about your exposure to cats. They may even request a serologic test for immunoglobulin G antibody to B. henselae.

Some of the common cat scratch fever symptoms include:
Fatigue
Low-grade fever
Rashes
Headache
Reddish round bump
Swollen lymph nodes near the site of cat bite or scratch
General malaise
Chills
Muscle pain

A small blister that resembles a bug bite at the site of cat bite or scratch (develops several days after a cat bite)
Abdominal cramps
Nausea

Other symptoms may include:
Weight loss
Appetite loss
Sore throat

An inoculation lesion is a small blister or bump that develops at the scratch or bite site.. This is the site where the bacteria enter your body. These painless lesions are commonly found on the head, in the arms, on hands, or on the scalp. As a result of the bite or scratch, the lymph nodes near the inoculation lesion will become swollen and tender within a couple of weeks.

Your underarm or neck area is where the swollen lymph nodes are more likely to appear, depending on the inoculation lesion site. The skin over the inflamed lymph nodes may feel warm and red, which is a common symptom of the cat scratch disease. Fever is more common among kids suffering from bartonellosis. The fever is usually less than 101°F.