Selection of Super Reproductive Parvovirus Strains for Vaccine Preparation by Alternate Cultivation in Cell Lines with Very Different Susceptibiilty
Abstract: This study has succeeded in selecting two strains(S_(18), S_(36)) of MEV with reproductive titre up to HA8192~×-32768~× or TCID_(50) Log_(10)~.7-10.3) from 6 strains of MEV with the titre 2~×- 64~× by alternate cultivation of 22 passages in two feline kidney cell(FKC) lines of susceptibility F_(81) strain and insusceptibility C_(81) strain ever reported as yet. The systematic tests proved that SMEV_(18,36) strains selected at present by alternative cultivation are super reproductive with powerful and extens...