Aim: The hospitalized children with Mycoplasma pneumonia (M. pneumonia) infection caused by respiratory tract infection in Chengdu were studied and analysis of the epidemiological characteristics was carried out to provide a theoretical basis for clinical diagnosis and treatment.
Method: 22882 hospitalized children with respiratory tract infections between January 2014 and December 2020 were collected M. pneumonia IgM antibody was detected by indirect immunofluorescence method and passive agglutination method. Demographic characteristics, clinical diagnose and laboratory data of these children were analyzed.retrospectively..
Result : The 4213 specimens with M. pneumonia were tested positive, the total positive rate was18.41%(18.30% in male and 22.72% in female). Higher positive rates were found in female children,Look from the statistical analysis results, the consistency between the two sets of data is low（ｘ2=198.078、P＜0.01）. The results of different age patients with contrast different M. pneumonia infection degree were statistically significant（F=162.7532、P＜0.01）,there was higher M. pneumonia positive rate in Preschoolers and school-age children ,33.98% and 32.98%, respectively.The incidence rate of M. pneumonia in 2017 and 2019 was significantly higher than average （F=538.95, P＜0.01)The difference of incidence rate of M. pneumonia was not significant in different months in 2014, 2015 and 2020 (P>0.05). But the probability of M .pneumonia infection patients was much higher from April to May and September to October in2016,2017,2018 and 2019（P＜0.05）. There was no correlation about M. pneumonia infection with temperature and humidity( P＞0.05)，there was negative correlation with PM2.5（R=0.09362, P<0.01）and PM10.（R=0.1185, P<0.01）.There was no difference about constituent ratio of case of M. pneumonia infection between 2014 and 2019 (F=32.34,P>0.05).The Common respiratory diseases of M. pneumonia infection, bronchopneumonia accounts for the highest proportion,followed the exacerbation of asthma and severe pneumonia.There was significantly difference about constituent ratio of case of M. pneumonia infection between in 2020 and in other years (F=159.35,P<0.01) .The Common respiratory diseases of M. pneumonia infection, bronchopneumonia accounts for the highest proportion,followed the acute bronchitis and exacerbation of asthma.
Conclusion:The distribution and epidemiological trend of M. pneumonia in patients with respiratory tract infection showed the risk of inflammation was connected with the gender, age, year and month, no relationship with temperature and humidity in Chengdu,.Higher M. pneumonia positive rate was shown in the children with bronchial pneumonia and exacerbation of asthma.The prevention measures which controlled the COVID-19 disease had effectively controlled the infection rate of M. pneumonia.