The preparation of a polyvalent feline calicivirus antiserum.

A polyvalent antiserum capable of neutralizing 82 isolates of feline calicivirus made from cats in various parts of North America was produced by the sequential inoculation of SPF cats at three-week intervals with feline calicivirus strains F-9, 68-2024 and FS, followed by a final booster inoculation two weeks after the third inoculation with all three strains combined. Sera raised against the same strains but individually and then pooled failed to show such broad cross-neutralizing capacity. The polyvalent serum should prove useful for the confirmation of an isolation of feline calicivirus.