Epidemiology and clinical features of rotavirus and norovirus infection among children in Ji'nan, China.

Abstract:

BACKGROUND:Acute gastroenteritis caused by bacteria, virus and parasite is an important cause of childhood morbidity and mortality in developing countries. Rotavirus and norovirus have been recognized as the most common pathogens causing acute gastroenteritis among children. However, there is still no valuable data about infections of rotavirus and norovirus in children in Ji'nan, an eastern city in China. The aims of the present study are to determine the incidence of rotavirus and norovirus associated acute gastroenteritis in Ji'nan among children, to characterize rotavirus and norovirus strains circulating during this period; and to provide useful epidemiological and clinical data. METHODS:Fecal specimens and clinical data were collected from 767 children (502 outpatients and 265 inpatients) under 5 years of age with acute diarrhea at Shandong University Qilu Hospital and Qilu children's Hospital in Ji'nan, China between February 2011 and January 2012. Virus RNA was extracted, amplified, electrophoresed, sequenced and phylogenetically analyzed to determine the prevalent genotypes. Chi-square and U test were used to compare characteristics of clinical manifestation in each group. RESULTS:Of the 767 specimens 263 (34.3%) were positive for rotavirus and 80 (10.4%) were positive for norovirus. Among 263 rotavirus positive cases, G3 (40.7%) was the most prevalent serotype, P[8] (46.8%) was the dominant genotype and G3P[8] (31.9%) was the most common combination. All of the norovirus strains belonged to GII genogroup including GII.3, GII.4 and GII.6, of which GII.4 (61.2%) was the predominant genotype. Phylogenetic analysis of the GII.4 sequences showed that 18 GII.4 strains belonged to GII.4 2004-2006 cluster and 31 GII.4 strains were divided into GII.4 2006b cluster. A peak number of rotavirus infections was observed during the cold season from November to next January. Higher rates of norovirus infections were detected from September to November. Most patients with rotavirus and norovirus associated diarrhea experienced vomiting (88.2% and 67.5%, respectively) and fever (79.1% and 46.3%, respectively). CONCLUSIONS:The present study showed that rotavirus and norovirus were still the important causative agents of pediatric diarrhea in Ji'nan during this period.

journal_name

Virol J

journal_title

Virology journal

authors

Sai L,Sun J,Shao L,Chen S,Liu H,Ma L

doi

10.1186/1743-422X-10-302

subject

Has Abstract

pub_date

2013-10-08 00:00:00

pages

302

issn

1743-422X

pii

1743-422X-10-302

journal_volume

10

pub_type

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