The FVRCP vaccine is a combination vaccination that protects cats against three highly contagious and life-threatening feline diseases: Feline Viral Rhinotracheitis (FHV-1), Feline Calicivirus (FCV), and Feline Panleukopenia (FPL). FHV-1 is a virus that causes respiratory infections in cats, while FCV causes respiratory infections and mouth ulcers. FPL is a virus that attacks the bone marrow and lymph nodes, leading to a low white blood cell count and preventing the cat from being able to activate their immune system normally. The FVRCP vaccine is one of two core vaccines for cats, which are shots that are strongly recommended for all cats regardless of whether they are indoor or outdoor cats. Kittens should receive their first FVRCP vaccination at around 6-8 weeks old and have a booster shot every three or four weeks until they are about 16-20 weeks old. After that, kittens will need another booster when they are just over a year old, then every three years throughout their lifetime.