Objective To understand the epidemiological characteristics and distribution of mycoplasma pneumoniae(MP)infection in hospitalized children with respiratory tract infection in Tianjin during 2017-2019,and to provide the scientific basis for the occurrence and prevalence of MP.Methods Based on RNA constant temperature amplification technology,MP-RNA test results of 9 303 hospitalized children with respiratory tract infections in Tianjin during 2017-2019 were collected and analyzed.Results The detection rate of MP-RNA in hospitalized children with respiratory tract infections in Tianjin from 2017 to 2019 was 32.46％(3 020/9 303),with a detection rate of 35.79％(1 428/3 990)for female children and 29.96％(1 592/5 313)for male children.The detection rate of MP-RNA in children of different genders had statistical significance(P＜0.01).The detection rate of MP-RNA in children of different age groups had statistical significance(P＜0.01),with the lowest detection rate of MP-RNA in the neonatal and infant groups being 9.56％(259/2 709),and the highest detection rate in the preschool group being 58.30％(1 282/2 199).MP could be detected in different months of the year,with the highest detection rate of MP-RNA in September being 52.62％(462/878).The detection rate of MP-RNA in children between different months was statistically significant(P＜0.01).There were seasonal differences in MP infection,with the detection rates of MP-RNA in spring,summer,autumn,and winter being 16.96％(351/2 069),34.08％(620/1 819),47.47％(1 332/2 806),and 27.48％(717/2 609),respectively.The detection rates of MP-RNA in different seasons were statistically significant(P＜0.01).There were significant differences in detection rates among different specimen types(P＜0.01),with the highest detection rate of MP-RNA in alveolar lavage fluid being 72.34％(889/1 229).Monthly relative humidity and average wind speed could affect the MP-RNA detection rate.The faster the wind speed and the lower the relative humidity,the lower the MP-RNA positive detection rate.Conclusion Among 9 303 hospitalized children with respiratory tract infection in Tianjin during 2017-2019,the detection rate of MP-RNA in female children was higher than that in male children.With the increase of age,the detection rate of MP-RNA increased.Autumn is the season with high incidence of MP.The detection rate of MP-RNA in alveolar lavage fluid specimens is higher than that in other specimen types.The positive detection rate of MP-RNA is correlated with wind speed and relative humidity.
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