Investigation of an outbreak of human metapneumovirus infection in Jingzhou City in 2022
Objective To analyze the epidemic characteristics and main causes of an outbreak of human metapneumovirus infection,and to provide reference for future work on prevention and control of epidemic.Methods In July 2022,an on-site epidemiological investigation was conducted on the outbreak of human metapneumovirus infection in a psychiatric hospital in Jingzhou City of Hubei Province.Environmental hygiene was investigated in order to understand the factors contributing to the spread of the epidemic.Throat swabs from patients were collected for nucleic acid testing of 22 common respiratory pathogens to identify the pathogens.Excel 2013 and SPSS 18.0 software were used for data organization and statistical analysis,and the difference of P＜0.05 was considered statistically significant.Results The epidemic lasted for 13 days and a total of 45 cases were searched,with an incidence rate of 25.42％.The clinical manifestations were mainly cough and fever,with no critical illness or death cases.The first case occurred on July 1,2022,the last case occurred on July 13,and the peak of incidence was on July 9.The cases were mainly distributed in the first floor ward of the third ward.The incidence rate in females was higher than that of males(x2=38.836,P＜0.001),and psychiatric patients was higher than that of medical personnel(x2=5.832,P=0.016).Among the 16 collected case specimens,9 cases showed positive nucleic acid test results for human metapneumovirus,with a positive rate of 56.25％(9/16).Conclusions The main reasons for this outbreak of epidemic were that the medical personnel was infected outside the hospital and then back on duty with the disease,and secondary cases were not isolated and treated in a timely manner.The important risk factors for the spread of the epidemic were that the doors and windows of air-conditioned wards were tightly closed in summer,and the frequency of disinfection was insufficient.
human metapneumovirusrespiratory infectionsoutbreak
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