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VANGUARD Plus CPV is a high-titer, modified-live canine parvovirus (CPV) strain attenuated by low passage on an established canine cell line. The combination of high titer and low passage gives VANGUARD Plus CPV the immunogenic properties capable of stimulating active immunity in the presence of maternal antibodies. Some puppies in the field may have higher levels of maternal antibodies than those evaluated in our pivotal efficacy study.