Objective: To analyze the influenza vaccine coverage in the coastal plain region of the State of Piauí in the period 2015-2020. Methods: This is a descriptive and exploratory research with a quantitative approach. Data were collected through the Information System of the National Immunization Program (SIPNI) and refer to influenza vaccination coverage in the Coastal Plain Region, located in the State of Piauí. It was decided to include four priority groups in the research: children aged 6 months to under 6 years, pregnant women, people over 60 years and health professionals. The collected data were tabulated and analyzed at Microsoft Office Excel software. The results of the descriptive analysis were presented through tables and graphs. Res...