Detection of Genotype 4 Swine Hepatitis E Virus in Systemic Tissues in Cross-Species Infected Rabbits

PLoS One. 2017 Jan 27;12(1):e0171277. doi: 10.1371/journal.pone.0171277. eCollection 2017.

Abstract

Increasing evidence demonstrates that hepatitis E virus (HEV) can be transmitted across species. According to previous reports, swine HEV has two genotypes, genotype 3 and 4, and both can infect humans by the fecal-oral route. Thus, it is crucial for the control of HEV zoonotic transmission to evaluate the dynamics of viral shedding and distribution in different tissues during cross-species infection by HEV. In this study, rabbits were infected with genotype 4 swine HEV by the intraperitoneal route. The results showed that HEV RNA not only shed in the feces but also in the saliva of some rabbits during infection with swine HEV. Viremia appeared late after infection, and anti-HEV IgG was not obvious until the appearance of high viremia levels. After the rabbits were euthanized, a histopathological examination showed that the livers developed overt hepatitis accompanied by an elevation of alanine aminotransferase (ALT) and aspartate transaminase (AST). Furthermore, HEV RNA was detected in various tissues, especially in the salivary glands and tonsils. Subsequently, negative-stranded HEV RNA was practiced in tissues with positive HEV RNA, which demonstrated that HEV replicated in the tissues. Next, we harvested additional tissues from the liver, salivary gland, tonsil, spleen, thymus gland, lymph node and intestine, which are known as replication sites of swine HEV. Additionally, we also observed the HEV antigen distributed in the organs above through immunohistochemical staining. These results demonstrate that rabbits could be used as an animal model for researching cross-species infection of genotype 4 HEV. It is also noteworthy that HEV can shed in the saliva and presents the risk of droplet transmission. These new data provide valuable information for understanding cross-species infection by HEV.

MeSH terms

  • Animals
  • Disease Models, Animal
  • Genotype
  • Hepatitis Antibodies / genetics
  • Hepatitis Antibodies / isolation & purification
  • Hepatitis E / genetics*
  • Hepatitis E / veterinary
  • Hepatitis E / virology
  • Hepatitis E virus / genetics*
  • Hepatitis E virus / pathogenicity
  • Humans
  • Liver / virology
  • RNA, Viral / genetics*
  • Rabbits
  • Swine
  • Swine Diseases / genetics*
  • Swine Diseases / virology

Substances

  • Hepatitis Antibodies
  • RNA, Viral

Grants and funding

This study was supported by National Natural Science Foundation of China (Grant No.31072110, 31272515).