Gap in measles vaccination coverage among children aged 9 months to 10 years in Ho Chi Minh City, Viet Nam, 2014
Viet Nam launched the Expanded Program of Immunization (EPI) in 1981 and subsequently, experienced a marked reduction of measles infection. However, a nationwide measles epidemic occurred in April 2014. Since the problem was due to a large proportion of non-vaccinated children, understanding the reasons for non-vaccination could address this problem. We performed a cross-sectional study to determine vaccination coverage and reasons for non-vaccination among children aged 9 months to 10 years in 7 suburban wards in Ho Chi Minh City with the highest number of measles cases in 2014. Thirty households were selected per ward. Measles vaccination status of the youngest child was determined and reasons for non-vaccination were investigated where needed. Children categorized as having received full vaccination were those aged above 18 months who received two doses of vaccine and children aged 9-18 months who received one dose. Partial vaccination included children of any age who did not receive any vaccine and children aged above 18 months who received only one dose. Chi-squared test and multiple logistic regression were use to identify independent predictors of vaccination. Full vaccination coverage was 48.0%. The study found three factors significant related to children’s vaccination status: children’s medical history, availability of parents/caregiver with regards to their working time, and mother’s immunization before pregnancy. These data suggest that the children’s medical history, availability of parents/caregiver and mother’s immunization before pregnancy could be used as indicators of EPI related in Viet Nam.
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