Immunization of Pups with Maternally Derived Antibodies to Canine Parvovirus (CPV) Using a Modified‐Live Variant(CPV‐2b)

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Abstract
Summary: The results of vaccination trials carried out on pups with maternally derived antibodies (MDA) to canine parvovirus (CPV), using a modified‐live CPV‐2b variant vaccine (29‐97/40 strain), are reported. The vaccine was able to overcome the obstacle of MDA, and to elicit protective immunity in 100% of the pups whose antibody titres were 1:10–1:40, 83% of the pups with titres of 1:80, 57% of the pups with titres of 1:160, and even in 60% of the pups with antibody titres of 1:320.