[Study on viral pathogens for infant diarrhea in Chizhou, Anhui].

OBJECTIVE

To understand the major viral pathogens for infant diarrhea in Chizhou, Anhui.

METHODS

Fecal specimens were collected from 428 infants hospitalized with diarrhea in People's Hospital of Chizhou, Anhui between January 2005 and December 2006. Enzyme immunoassay (EIA) and enzyme-linked immunosorbent assay (ELISA) were performed to detected specific antigens of rotavirus, astrovirus, adenovirus or calicivirus. For rotavirus, specimens were tested for typing by serum virology and reverse transcription PCR (RT-PCR).

RESULTS

The positive test rates for rotavirus, calicivirus and adenovirus were 29.2%, 10.5% and 2.4%, respectively, in infants with diarrhea from Chizhou, Anhui. Among them, 3 cases (2.4%) were infected with two or more viruses. Forty-four fecal specimens were tested with ELISA and RT-PCR for rotavirus, and the results showed that the two methods got consistency of 97.7%. Another 48 rotaviruses of serotype G were further typed as serotype I (3 cases), II (1 case), III (35 cases) and IX (2 cases), with 7 cases untyped. Among the cases that could be typed, 26 cases were collected from 2005, and 15 from 2006. RV type ml was the major pathogens for infant diarrhea, with 24 from 2005 and 11 from 2006. Among the 8 rotaviruses of type P, 7 were type as G3P8 and one G9P8. The epidemic of rotavirus showed significant season privilege, with a high prevalence in winter-spring, while the prevalence of calicivirus was prone to be high in Fall.

CONCLUSION

Rotavirus was the major viral pathogen accounting for infant diarrhea in Chizhou, Anhui, followed by calicivirus and adenovirus Type G3 was the main rotavirus, especially type G3P8.