The present invention relates to new cat capsid proteins, attenuation feline calicivirus living comprising the capsid protein, live recombinant carrier virus comprising the capsid protein and attenuation heterozygosis feline calicivirus living, vaccine comprising such attenuation feline calicivirus living, live recombinant carrier virus and attenuation heterozygosis feline calicivirus living, and the method for being used to prepare this viroid.