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  • Title: Norovirus genotype IIb associated acute gastroenteritis in India.
    Author: Chhabra P, Chitambar SD.
    Journal: J Clin Virol; 2008 Aug; 42(4):429-32. PubMed ID: 18467163.
    Abstract:
    BACKGROUND: In India the role of noroviruses in causing gastroenteritis is not well defined. OBJECTIVE: To determine the norovirus prevalence in sporadic cases of acute gastroenteritis in western India. STUDY DESIGN: A total of 236 fecal specimens consisting 192 specimens from hospitalized and 44 from OPD (outpatient department) children < or = 5 years of age were tested for the presence of norovirus genogroup (G)I and GII by RT-PCR followed by sequencing. Multiple alignment and phylogenetic analysis were carried out to determine the norovirus genetic types. RESULTS: Norovirus GII infection was detected in 11.9% (28/236) specimens. These included 24 of 192 (12.5%) specimens from hospitalized and 4 of 44 (9.0%) specimens from OPD cases. Nucleotide sequence based analysis of norovirus GII strains indicated circulation of GIIb strains at a significant level in hospitalized (12.5%) and OPD (75%) children. CONCLUSION: This study demonstrates the predominance of GII/4 (genogroup II/genotype 4) along with co-circulation of GII/1, GII/2, GII/3 and GIIb revealing the possibility of norovirus as the second most common cause of non-bacterial acute gastroenteritis after rotavirus in western India. It also documents for the first time occurrence of norovirus GIIb infections in India.
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