Porcine circovirus type 2 (PCV2) infection in Hebei Province from 2016 to 2019: a retrospective study.

Porcine circovirus type 2 (PCV2) is the primary causative agent of porcine circovirus-associated diseases in swine, the most common of which are postweaning multisystemic wasting syndrome (PMWS) and porcine dermatitis and nephropathy syndrome (PDNS). To investigate the prevalence and genetic diversity of PCV2 in Hebei Province, Northern China, from 2016 to 2019, a total of 448 suspected cases of PCV2 infection were studied, and 179 samples were positive for PCV2. A pathological and histopathological examination suggested PCV2 to be cause of the observed lesions. Phylogenetic analysis showed that four genotypes were prevalent in Hebei Province: PCV2a, 2b, 2d, and 2e. Analysis of PCV2 strains using RDP4 and SimPlot showed that there were genetic recombination events among PCV2 strains in Hebei Province. A total of 3284 serum samples were screened by ELISA, and the positive rate of PCV2 antibodies was 73.9% (2428/3284). This study provides a scientific reference for the prevention and treatment of PCV2 in Hebei Province.

Seroprevalence of porcine bocavirus in pigs in north-central China using a recombinant-NP1-protein-based indirect ELISA.

Porcine bocavirus (PBoV), which belongs the genus Bocaparvovirus, has been identified throughout the world. However, serological methods for detecting anti-PBoV antibodies are presently limited. In the present study, an indirect enzyme-linked immunosorbent assay (PBoV-rNP1 ELISA) based on a recombinant form of nucleoprotein 1 (NP1) of PBoV was established for investigating the seroprevalence of PBoV in 2025 serum specimens collected in north-central China from 2016 to 2018, and 42.3% of the samples tested positive for anti-PBoV IgG antibodies, indicating that the seroprevalence of PBoV is high in pig populations in China.