Epidemiological characteristics of measles in Liaocheng city of Shandong province from 2010 to 2022
Objective To analyze the epidemiological characteristics of measles in Liaocheng city from 2010 to 2022,and provide basis for the elimination of measles in Liaocheng.Methods The epidemiological characteristics of measles was analyzed with retrospective epidemiological methods in Liaocheng city from 2010 to 2022.Results Out of 1 356 measles cases reported in Liaocheng city from 2010 to 2022,there were 1 262 cases confirmed by laboratory testing,and 94 cases clinically diagnosed.The average annual reported incidence rate was 1.77/100 000,and showed decreasing trend(trend x2=2 934.037,P<0.001)in different years.The reported incidence rate was high in 2010 and 2013-2016,and the epidemic was sporadic in other years.Measles cases were mainly concentrated from January to June and December.The top three reported incidence rates in the city were Dongchangfu district,Gaotang county and Dong'e county in turn.About 91.15%of the total cases were people aged less 3 years and over 20 years old,58.92%of the cases had no history of measles-containing vaccine(MCV),and 25.00%don't know if they have been vaccinated.There were 232 suspected measles cases in which measles virus genotypes were available,including 226 cases with H1 genotypes,6 cases with vaccine strain A genotype..Conclusions The reported incidence of measles in Liaocheng city decreased from 2010 to 2022,and reached lowest incidence in 2020.It is necessary to maintain high coverage rate and timely vaccination rate of 2 doses of MCV in school-age children.Take the initiative to carry out MCV vaccination and strengthen the monitoring of key populations in large age groups,especially in counties(districts)with large population movements and bordering with foreign provinces(cities).The measles surveillance system should be maintained with high quality operation,and to increase the rate of positive testing of pathogenetic specimens.