Feline Rhinotracheitis, Calicivirus, Panleukopenia, Chlamydia - this vaccine is sometimes called the “feline distemper”, but actually helps protect cats from upper respiratory diseases which is one of the main illness cats visit the veterinarian. This vaccination can be started at 6-8 weeks of age. This requires two boosters after 10 weeks of age. So if the patient starts the vaccine at 6 weeks of age he/she will get 3 vaccines when they are finished with their series. If the patient is 10 weeks they will only need 2 vaccines. Revaccination can be done as early as 10 days and at the latest 30 days, but general we recommend coming back between 2-3 weeks to administer boosters.