The first vaccination is given to a kitten when it is between 6 and 8 weeks old, and further vaccinations are given every 3 to 4 weeks until the kitten is 4 months old.Your kitten will be protected from the illnesses that affect the majority of cats, including feline distemper (panleukopenia), feline viral rhinotracheitis (feline herpes virus 1), calicivirus, and rabies, by receiving the standard or core immunizations.