Infectivity titration of a prototype strain of hepatitis E virus in cynomolgus monkeys.

Abstract:

:The infectivity titer of a standard stock of the SAR-55 strain of hepatitis E virus (HEV) was determined in cynomolgus macaques (Macaca fascicularis) and the effect of dose on the course of the infection was examined by weekly monitoring of alanine aminotransferase (ALT) and anti-HEV levels. Antibody to HEV (anti-HEV) was measured with ELISAs based on ORF-2 recombinant antigens consisting of either a 55 kDa region expressed in insect cells or shorter regions expressed as fusion proteins in bacteria. The ELISA based on the 55 kDa antigen was generally more sensitive. The infectivity titer of SAR-55 was 10(6) cynomolgus 50% infectious doses per gram of feces. The infectivity titer corresponded to the HEV genome titer of the inoculum as determined by reverse transcriptase-polymerase chain reaction (RT-PCR). Anti-HEV IgM was detected in only a portion of the animals that had an anti-HEV IgG response. Biochemical evidence of hepatitis was most prominent in animals that were inoculated with the higher concentrations of virus and the incubation period to seroconversion was prolonged in animals that received the lower doses.

journal_name

J Med Virol

authors

Tsarev SA,Tsareva TS,Emerson SU,Yarbough PO,Legters LJ,Moskal T,Purcell RH

doi

10.1002/jmv.1890430207

subject

Has Abstract

pub_date

1994-06-01 00:00:00

pages

135-42

issue

2

eissn

0146-6615

issn

1096-9071

journal_volume

43

pub_type

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