Investigation and analysis of an outbreak of influenza in a school in Yucheng District of Yaan City in 2021
Objective To analyse an outbreak of influenza in a school in Yucheng District of Yaan,and to explore the causes,risk factors and countermeasures of the outbreak.Methods With the method of field epidemiological investigation,in November 2021,a case investigation was conducted on influenza-like illness outbroke in a school in Yucheng District of Yaan City.Throat swabs of influenza-like cases were collected by oropharynx swabs.Real-time fluorescent quantitative PCR was used to detect influenza virus RNA.Results A total of 30 confirmed cases and 15 clinically diagnosed cases were reported,with an attack rate of 2.19％.A total of 45 throat swabs of influenza-like cases were collected and 30 of them were positive for influenza B and 15 of them were negative for influenza B.The positive rate was 66.67％.It was confirmed that influenza B was an epidemic influenza.The outbreak may be due to the first case of the early symptoms of the disease was not obvious,not timely isolation led to an outbreak of influenza.With the active cooperation of relevant departments,the epidemic situation had been effectively controlled.Conclusions The epidemic is caused by influenza B virus infection,and the possible transmission routes are respiratory tract transmission and close contact transmission.
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