Establishment of Hainan Provincial Influenza Monitoring System and analysis of effect of operation.

Objective To know the character and etiological distinction of influenza spread promptly ,and to prevent pandemic occurrence caused by varied influenza strain variation in Hainan province. Methods Analysis the result of viral identify and isolation of a particular influenza-like disease ,as well as survey epidemic situation outbreak from influenza monitoring site data within the year of 2004. Results 1 142 cases of influenza-like disease were monitored in the site yearly ,they accounted all the clinic service patients by 0.36% and the peak time was May and Auguest.There were two epidemic outbreaks all the yeare and 306 cases of morbidity were found ,its attack rate was 8.46%.477 cases influenza-like disease throat swab sample were collected and 63 influenza viral strains were isolated (isolating rate 13.21%) among them there were 41 strains of H3N2 ,22 strains of B type.The isolating rate conincided with the influenza peak time. Two epidemic outbreaks was viral strains H3N2. Conclusion The peak time of influenza spread in Hainan are summer and autumn.The influenza was caused by H3N2 and B type alternatively,and the predominant strain is H3N2. There was no influenza mutation and high pathogenicity bird flu strains discovered in our study.