Monitoring and Analysis on Influenza in Yuxi City in 2009

[Objective] To understand the epidemic dynamics of influenza in Yuxi city, reveal the changes of epidemic situation and etiology of influenza, so as to improve the control and prevention of influenza.[Methods]According to the national influenza surveillance program, the throat swab specimens were collected from influenza-like illness of outbreak and the sentinel hospital, and detected with real-time RT-PCR.[Results]In 2009, 980 samples of influenza-like illness were detected in influenza network laboratory in Yuxi. 143 cases were positive for influenza A H1N1 nucleic acids with the positive rate of 14.59%, 11 cases were positive for influenza A H1 with the positive rate of 1.33%, 80 cases were positive for influenza A H3 with the positive rate of 8.16%, and 6 cases were positive for influenza B nucleic acids with the positive rate of 0.61%.[Conclusion]In Yuxi city, there existed seasonal influenza H1 and H3, influenza B and influenza A H1N1 simultaneously, and the influenza A H1N1 has gradually become the dominant virus strain.