Abstract
BackgroundMeasles is a highly infectious disease, and timely administration of two doses of vaccine can ensure adequate protection against measles for all ages in a population. This study aims to estimate the proportion of children aged 8 months to 6 years vaccinated on time with measles-containing vaccines (MCV) and vaccinated during the 2008 and 2010 measles supplementary immunization activities. This study also characterizes differences in mean age at vaccination and vaccination timeliness by demographic characteristics, and describes maternal knowledge of measles vaccination.MethodsImmunization records were selected from a convenience sample of immunization clinics in Tianjin, China. From the records, overall vaccination coverage and timely vaccination coverage were calculated for different demographic groups. Mothers were also interviewed at these clinics to ascertain their knowledge of measles vaccination.ResultsWithin the 329 immunization clinic records, child’s birth year and district of residence were found to be significant predictors of different measures of vaccine timeliness. Children born in 2009 had a lower age at MCV dose 2 administration (17.96 months) than children born in 2005 (22.00 months). Children living in Hebei, a district in the urban center of Tianjin were less likely to be vaccinated late than children living in districts further from the urban core of Tianjin. From the 31 interviews with mothers, most women believed that timely vaccination was very important and more than one dose was very necessary; most did not know whether their child needed another dose.ConclusionsWhen reviewing MCV coverage in China, most studies do not consider timeliness. However, this study shows that overall vaccination coverage can greatly overestimate vaccination coverage within certain segments of the population, such as young infants.
Highlights
Measles is a highly infectious disease, and timely administration of two doses of vaccine can ensure adequate protection against measles for all ages in a population
This study aims to estimate the proportion of children aged 8 months to 6 years who were vaccinated on time with measles-containing vaccines (MCV) and vaccinated during the 2008 and 2010 Supplementary immunization activity (SIA)
MCV3 was recorded for 67 children, the average age at MCV3 was 5.04 years, and slightly more than three-fourths of children who were eligible for vaccination were vaccinated on time (Table 1)
Summary
Measles is a highly infectious disease, and timely administration of two doses of vaccine can ensure adequate protection against measles for all ages in a population. This study aims to estimate the proportion of children aged 8 months to 6 years vaccinated on time with measles-containing vaccines (MCV) and vaccinated during the 2008 and 2010 measles supplementary immunization activities. Morbidity and mortality from measles have decreased worldwide in recent years because of these global elimination efforts. China has seen some cyclical resurgence of measles; the government’s officially published national incidence rate increased from 5.7 cases per 100,000 persons in 2000 to 9.56 cases per 100,000 persons in 2005 [6] but fell to 0.46 cases per 100,000 persons in 2012 [5]. Between 2005 and 2008, measles incidence in Tianjin increased from 7.64 to 16.10 cases per 100,000 persons. This was followed by a period of decreasing case counts, after which the reported measles incidence in Tianjin again increased from 1.44 to 15.74 cases per 100,000 persons between 2009 and 2010 [Unpublished data, Tianjin Centers for Disease Control and Prevention (CDC), 2014]
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