Protective efficacy of the bivalent inactivated vaccine against lethal Newcastle disease virus infection.
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ASPF chickens were challenged intramuscularly with 100 µl of 105.5 EID50 of the virulent NDV virus 3 weeks post-vaccination.BHemagglutination-inhibition titers against the homologous antigen were determined 3 weeks after vaccination using chicken erythrocytes.CDepression was observed in non-vaccinated chickens before death.MDT, mean death time in days.
创建时间：
2015-12-02
