The most common disease in cats is feline immunodeficiency virus ( FIV) which affects the red blood cells of cats. Characterized with vomiting, lethargy, aggressiveness, lack of appetite, and inactivity among other symptoms.
This disease is not directly fatal to cats but since it weakens their immune system it can cause them to be more prone to other diseases that may be more fatal. Also, there is no cure for this disease.
Cats can be affected by a variety of diseases, including respiratory infections, heart disease, and cancer. The most fatal disease for cats is feline leukemia virus (FeLV), which is caused by a virus that can be spread through contact with an infected cat. Signs and symptoms of FeLV may include weight loss, poor appetite, and difficulty breathing. It is important to take your cat to the vet for regular checkups to help detect and prevent any potential diseases.