Objective To analyze the epidemiologic characteristics of measles and related influencing factors in Baiyun district of Guangzhou from 2009 to 2019 and provide evidence for measles prevention and control.
Methods The measles surveillance system was used to carry out descriptive analysis on confirmed measles cases in Baiyun district from 2009 to 2019 and discuss the influencing factors.
Results From 2009 to 2019, a total of 1430 confirmed measles cases were reported in Baiyun district, with an average annual incidence of 6.74/100 000, the cases mainly occurred during April – July, but the seasonality has been less obvious in recent years. The cases were mainly children aged <2 years and adults aged 20—29 years. The cases were mainly distributed in population from other cities or provinces. The cases with 0 dose, 1 dose, ≥2 doses, and unknown immunization history of measles-containing vaccines (MCV) accounted for 61.73%, 7.26%, 17.46%, and 29.12%, respectively. The risk factors for measles in <18 years old group included being in floating population and medical treatment seeking history 7—21 days before onset (P<0.05), and being on local population and history of MCV vaccination were the protective factors. Being in floating population was a risk factor for measles in people aged ≥18 years (P<0.05).
Conclusion Measles mainly occurred sporadically in Baiyun district, the incidence showed a single peak pattern and decline trend. Children aged <2 years and adults aged >20 years in floating population were the key populations in measles prevention and control. It is necessary to strengthen the active case finding in floating population, vaccination certificate check for the entrancement of private schools, active measles surveillance in medical institutions and encourage young migrant workers with unknown measles vaccination history to receive MCV, conduct accurate supplementary vaccination and take multiple measures to prevent periodic measles epidemic.
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