Feline parvovirus, also known as feline panleukopenia virus, is a highly contagious virus that primarily affects cats. It attacks the rapidly dividing cells in a cat's body, particularly in the intestines, bone marrow, and lymphatic system. Symptoms include vomiting, diarrhea, lethargy, and a decrease in appetite. The virus is transmitted through direct contact with an infected cat or contaminated surfaces, food, or water. Vaccination is the most effective way to prevent infection, and it is recommended for all kittens and adult cats. Early diagnosis and supportive care can improve the chances of recovery.