Epidemiologic study of influenza A/H1N1 outbreak in a middle school in Haidian District,Beijing

Objective To study the epidemiological characters of an influenza A/H1N1 outbreak in a middle school in Haidian district,and to provide effective and scientific measures of respiratory diseases prevention and control in schools.Methods The data of every patient and basic information of school were collected,and epidemiological descriptive analysis was conducted in the study.Results The duration of the influenza A/H1N1 outbreak was seventeen days.One hundred and nine patients were diagnosed and the attack rate of students was 5.08%(104/2 048),the attack rate of teachers was 2.23%(5/224) and the proportion of recessive infected patients was 7.34%(8/109).The incidence rate of influenza likely patient of 2009 was higher than that of 2008.In the early period,most patients were grade two of junior high school,while in the middle period and the later period,most patients were grade three of junior high school.There was no obvious sexual variation in the attack rate of A/H1N1 influenza;The clinical symptoms of patients were typical.The proportions of influenza A/H1N1 patient was 30.95%(104/336) in influenza likely patients.Conclusion The first patient in this A/H1N1 influenza outbreak is infected in community.Carrying out strict morning-noon health check-up and epidemic situation reporting system,timely isolation of patients and people around patients,implementation of health propaganda and inoculation are successfully utilized in control of epidemic influenza.