Generation of canine neutralizing antibodies against canine parvovirus by single B cell antibody technology

Canine parvovirus (CPV) is a significant threat to canines and is widely distributed worldwide. While vaccination is currently the most effective preventive measure, existing vaccines are not able to offer comprehensive and dependable protection against CPV infection. Hence, there is a need to explore alternative or complementary strategies to tackle this problem. In this study, we present an approach for the efficient screening of canine antibodies targeting CPV using a single B cell antibody technique. We sorted single IgM^- IgG⁺ CPV⁺ B cells from canine peripheral blood mononuclear cells using fluorescence-activated cell sorting (FACS) and obtained the variable region genes of heavy and light chains (VH and VL) by nested PCR amplification. Canine monoclonal antibodies were expressed in HEK293 cells, and a total of 60 antibodies were obtained, five of which demonstrated neutralizing activity against CPV. Those findings demonstrate the effectiveness of the method for obtaining canine monoclonal antibodies, which in turn aids in the identification and screening of neutralizing antibodies against various canine pathogens.