1887

Abstract

Seventeen Indian hepatitis E virus (HEV) isolates, representing epidemic and sporadic hepatitis E cases during 1976-1991, were sequenced in the RNA polymerase (RNAP) region. Five isolates were also sequenced in the non-structural hypervariable region of open reading frame 1. Open reading frames 2 and 3 were sequenced only for the prototype isolate. On the basis of the comparison of all the available sequences of the conserved RNAP region, the HEV isolates were divided into three genotypes, differing from each other by >15%. Genotype I included African and Asian isolates, whereas II and III were represented by Mexican and US isolates, respectively. Genotype I was further divided into four sub-genotypes. The majority of the Indian isolates (15/20), along with the Burmese and Nepali isolates, belonged to genotype IA. Genotype IB included HEV isolates from China, Pakistan and the former USSR and 2/20 Indian isolates, which represented the oldest (1976) HEV sequenced so far. Genotype IC included both the African isolates, whereas 3/20 Indian isolates formed genotype ID. Nucleotide sequence analysis of other regions of the HEV genome also placed isolates in the same genotypes. Both the Indian cities experiencing second HEV epidemics, after intervals of 8 and 10 years, showed shifts in the sub-genotypes found; from IB (Ahm-76) to IA (Ahm-84) and from IA (Kol-81) to ID (Kol-91). However, no major shift in the genotypes was noted. Overall, HEV genotypes appear to be segregated geographically.

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1999-07-01
2021-09-24
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