Trend in Vaccination Coverage in children aged zero to 12 months – Piauí, Brazil, 2013-2020

ABSTRACT The study aimed to analyze the temporal trend of Vaccination Coverage (VC) in children from 0 to 12 months of age. This is an ecological time series study of VC in children aged 0 to 12 months, Piauí, from 2013 to 2020, using data from the National Immunization Program Information System. The Prais-Winsten autoregressive model was used to estimate the VC trend for eight immunobiologicals. Trends were categorized as decreasing, increasing, or stationary. There was a reduction in the VC of all immunobiologicals. There was a decreasing trend in the VC of Hepatitis B (annual percentgage change [APC] = -4.5; 95%CI: -7.3; -1.6), Meningococcal C (APC = -1.7; 95%CI: -3.1; -0.2), Pentavalent (APC = -4.2; 95%CI: -7.0; -1.3) and Yellow Fever (APC = -3.2; 95%CI: -5.9; -0.5); and stationary values for BCG (APC = -2.5; 95%CI: -5.7; 0.9), Human Rotavirus (APC = -1.5; 95%CI: -3.2; 0.2), Pneumococcal (APC -0.7; 95%CI: -2.7; 1.3); and Poliomyelitis (APC = -2.1; 95%CI: -5.3; 1.1). It was concluded that with the decreasing and stationary trends of VC, it is necessary to develop public policies to clarify and recruit the population about vaccination in children from 0 to 12 months of age.