Abstract
The classical swine fever virus (CSFV) is a species member of the family Flaviviridae. CSFV is widely distributed in the world causing a severe impact on pig industry. This pathogen is considered restricted to domestic and wild suids. However, some reports from 2014 to 2018 showed the presence of the CFSV antigen in the bovine species. The virus was found in commercialized batches of fetal bovine serum (FBS) of Chinese origin and in bovine herds in in the provinces of Henan and Jiangsu, China, and in Tamil Nadu and Meghalaya, southern and north‑eastern states of India, respectively. Detection was done using antigen capture ELISA and RT‑PCR tests. In certain cases, animals with natural infection showed clinical signs and reproduction was also affected. Genetic characterization was performed considering the 5'‑UTR sequences of the bovine strains. In addition, the entire CSFV E2 genomic region could be amplified from two positive animals. The bovine strains were genetically related to the Chinese CSFV live attenuated hog cholera lapinized vaccine (HCLV) strain used in pigs, sharing sequence characteristics. The vaccine strain HCLV was widely used in China to protect bovines and yaks from bovine viral diarrhea, and, as a possible consequence, inducing an adaptation in cattle and a further natural diffusion. Furthermore, a contaminant strain from China was genetically distant from all other previously described genotypes of the CSFV. This suggests also the occurrence of micro evolutive step in the species related to geographical segregation. These observations deserve attention and further investigations, especially relevant in countries where CSFV control and eradication strategies are applied.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.