A large outbreak of acute gastroenteritis caused by the human norovirus GII.17 strain at a university in Henan Province, China.

Background: Human noroviruses are a major cause of viral gastroenteritis and are the main etiological agents of acute gastroenteritis outbreaks. An increasing number of outbreaks and sporadic cases of norovirus have been reported in China in recent years. There was a large acute gastroenteritis outbreak at a university in Henan Province, China in the past five years.

[Investigation on distribution of Yersinia enterocolitica in Henan province between 2005 and 2011].

Objective: To investigate the distribution of Yersinia enterocolitica in Henan province from 2005 to 2011.

Methods: A total of 6700 samples of stool specimen were collected from diarrhea patients and different domestic animals between 2005 and 2011 from Zhengzhou, Suixian and Dengfeng, as well as flies and the daub specimens of raw and cooked meat products. The bacteria were isolated by cold enrichment method, analyzed by the systematic biochemistry to determine the serotypes and bio-types, and tested the virulence genes by PCR method.

[Analysis of etiological surveillance results of Shigella spp between 2009 and 2010 in Henan province].

Objective: To explore the etiologic characteristics of bacillary dysentery found in Henan province, between year 2009 and 2010.

Methods: In order to explore the distribution of bacterial types, drug susceptibility and the virulence gene carrier situation, 482 strains of Shigella isolated in Henan province between 2009 and 2010 were pathogen-detected and analyzed by serotype screening, anti microbial sensitivity test and PCR methods.

Results: The 482 isolated strains were confirmed to be Shigella by both morphological and biochemical tests.

[Etiology survey on an outbreak of viral encephalitis].

Objective: To isolate and identify the pathogen that caused an outbreak of viral encephalitis in Henan province in 2010; and to analyze the genetic characteristic of gene viral protein1(VP1) on the viral strains isolated.

Methods: During the period of the outbreak of viral encephalitis in Lushan county, Pingdingshan city, Henan province, eight hospitalized patients were recruited in the study. All the patients' feces samples were collected.