Experimental infection of pigs with the newly identified swine hepatitis E virus (swine HEV), but not with human strains of HEV |
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| Authors: | X-J Meng P G Halbur J S Haynes T S Tsareva J D Bruna R L Royer R H Purcell S U Emerson |
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| Institution: | (1) Hepatitis Viruses Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, U.S.A., US;(2) College of Veterinary Medicine, Iowa State University, Ames, Iowa, U.S.A., US |
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| Abstract: | Summary. A novel virus of pigs, swine hepatitis E virus (swine HEV), was recently identified and shown to be antigenically and genetically
related to human HEV. In the present study, we attempted to infect specific-pathogen-free (SPF) pigs experimentally with swine
HEV or with human strains of HEV. Serum samples collected from naturally infected pigs were used as the source of swine HEV.
Pigs inoculated intravenously with serum samples containing swine HEV seroconverted to anti-HEV 4 to 8 weeks postinoculation,
and the virus spread to an uninoculated pig. Swine HEV was detected in nasal and rectal swab materials as early as 2 weeks
postinoculation and for 4 to 8 weeks thereafter. Viremia appeared 4 to 6 weeks postinoculation and lasted 1 to 3 weeks. The
inoculated pigs appeared clinically normal and serum liver enzymes were not significantly elevated. In contrast, pigs were
not infected when inoculated intravenously with about 105 monkey infectious doses of one of two human strains of HEV (Sar-55 or Mex-14).
Received December 9, 1997 Accepted February 18, 1998 |
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