Nobivac Feline 1-HCP+FeLV is a combination vaccine for cats that protects against multiple feline viruses. It's a core vaccine that's recommended for healthy cats that are at least nine weeks old. Nobivac Feline 1-HCP+FeLV offers protection against Feline rhinotracheitis, Calici virus, Panleukopenia, and Feline leukemia virus (FeLV).