Epidemiological characteristics of measles in epidemic years before and after measles vaccine supplement immunization activities in Kaifeng city

Objective To analyze the epidemiological characteristics of measles in epidemic years before and afterSupplementary Immunization Activity(SIA) of Measles Vaccine(MV) performed in 2010 in Kaifeng city and explore effectiveapproach for measles elimination. Methods Descriptive epidemiological method was used to analyze the data of measles intwo epidemic years before and after MV SIA. Results The annual incidence of measles in 2008 was 17.40/100 000,anddeclined to 2.08/100000 in 2013 after the SIA,declined by 85.75%.The incidence decreased drastically among all age groupsafter SIA except age group of 45-49 years.Cases were not observed among the immunization coverage group(4-17 years).Themeasles had a highest incidence in children under one year old,being 410.73/100 000 in 2010 and 125.32/100 000 in 2013,respectively.Another epidemic peak was observed among age group of 20-30 years.Proportions for cases with immunity historybefore and after SIA were 31.04% and 25.64%,while the proportions were 7.78% and 66.67% for cases with immunizationhistory 7-21 days before illness. Conclusion The incidence of measles significantly decreased after the MV SIA performedin Kaifeng city in 2010, Immunization coverage rate of measles should be increased to prevent the prevalence of the disease.