Analysis of 2009-2011 Influenza Surveillance in A Sentinel Hospital

Objective To analyze the results of the influenza surveillance from 2009 to 2011,explore influenza pandemic characteristics and pandemic variation to provide a scientific basis for the prevention and control of influenza pandemic.Methods The influenza-like illness and etiology results from 2009 to 2011 were analyzed.Results The total number of the flu-like cases was 1405.The treatment peak appeared in October to November 2009 and November 2010 to January 2011.The incidence of the people 15-24 years old and 25-59 years old were higher than others.986 throat swab specimens were collected,among which 294 samples were positive,making the positive rate 29.82%.Different strains predominated in different times,and sometimes various influenza viruses coexist.Conclusion Influenza prevails seasonally.Strengthening the monitoring of the influenza and detection of influenza virus mutates and giving standard vaccination and the education of health to the population can reduce the harm of the influenza to people.