Reaction rate in cats vaccinated with a new controlled-titer feline panleukopenia-rhinotracheitis-calicivirus-Chlamydia psittaci vaccine.

The safety profile of a new controlled-titer feline panleukopenia-rhinotracheitis-calicivirus-Chlamydia psittaci vaccine was compared to that of a currently-marketed vaccine. Of particular interest were delayed reactions (previously unreported in the literature in felines) occurring 7 to 21 days after vaccination, and the effect of concurrent vaccinations and cat age on the delayed reaction rate. Nineteen hundred twenty-four doses of the new vaccine and 364 doses of the comparison vaccine were administered in 42 participating veterinary practices. The postvaccination evaluation period was 21 days. Reactions (anaphylaxis, short- and long-term lethargy, inappetence, pain, upper respiratory inflammation, delayed fever, anorexia, and miscellaneous events) were reported in 3.33% of cats receiving the controlled-titer vaccine and in 3.02% of cats receiving the comparison vaccine. The difference was not statistically significant (P = 0.45). Reaction rate of the controlled-titer vaccine and that of the vaccine currently accepted by veterinarians appear to be equivalent.