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- Title
Unchanged high prevalence of antibodies to hepatitis E virus (HEV) and HEV RNA among blood donors with an elevated alanine aminotransferase level in Japan during 1991–2006.
- Authors
Fukuda, S.; Ishikawa, M.; Ochiai, N.; Suzuki, Y.; Sunaga, J.; Shinohara, N.; Nozawa, K.; Tsuda, F.; Takahashi, M.; Okamoto, H.
- Abstract
Hepatitis E is rare in Japan but is occurring more frequently than previously thought. To investigate whether de novo subclinical infection of hepatitis E virus (HEV) has recently increased in Japan, HEV RNA was assayed in serum samples obtained from 4019 Japanese voluntary blood donors with alanine aminotransferase (ALT) of ≥61 IU/l, who are likely to have ongoing HEV infection, during 1991–2006. The overall rates of IgG-class antibody to HEV (anti-HEV IgG), anti-HEV IgM/IgA and HEV RNA among 3185 donors in 2004–2006 were comparable with those among 594 donors in 1998 (5.3 vs. 5.2%, 0.2 vs. 0.5%, and 0.2 vs. 0.3%, respectively). Among blood donors with ALT ≥ 201 IU/l in three groups according to the year of blood collection (1991–1995 [ n = 156], 1996–1999 [ n = 116] and 2004–2006 [ n = 61]), there were no appreciable differences in the prevalence of anti-HEV IgG (5.8, 4.3, and 6.6%, respectively), anti-HEV IgM/IgA (1.9, 3.4, and 3.3%, respectively) and HEV RNA (1.3, 3.4, and 3.3%, respectively). The eleven HEV isolates obtained in the present study differed from each other by 1.7–22.8% in the ORF2 sequence and segregated into genotype 3 or 4. The occurrence rate of subclinical infection with divergent HEV strains has essentially remained unchanged during 1991–2006 in Japan.
- Subjects
JAPAN; HEPATITIS E; ALANINE; AMINOTRANSFERASES; RNA
- Publication
Archives of Virology, 2007, Vol 152, Issue 9, p1623
- ISSN
0304-8608
- Publication type
Article
- DOI
10.1007/s00705-007-0996-z