CANINE INFLUENZA VIRUS VACCINATION PROTOCOLS Situation Current First Vaccination Booster in 3 Weeks 1 CIV H3N2 and CIV H3N8 CIV Bivalent None 2 CIV H3N2 CIV Bivalent or CIV H3N8 3 CIV H3N8 CIV Bivalent or CIV H3N2 4 No history of CIV vaccination The revaccination interval has not been established for CIV Bivalent. Historically annual revaccination has been recommended for CIV and this is consistent with what we support with our Companion Animal Immunization Support Guarantee SAB-00621