Longitudinal assessment of influenza vaccination coverage in Spain: The “Gripómetro” as a real-time monitoring tool

Delayed availability of vaccine coverage statistics can limit within-season situational awareness for seasonal influenza vaccination campaigns. This longitudinal ecological study evaluated influenza vaccination coverage (IVC) in Spain across five seasons (2018/19 to 2022/23) using the real-time monitoring tool Gripómetro, based on weekly landline telephone interviews conducted for six consecutive weeks starting 14 d after campaign launch. Adults aged 18-80 y from the Spanish population and healthcare workers (HCWs) from public primary care centers were surveyed using a semi-structured questionnaire. An overall IVC increase was observed during the COVID-19 pandemic, peaking in the 2020/21 season. Among individuals aged ≥65 y, coverage rose from 56% in 2018/19 to 68% in 2020/21 and remained stable thereafter, below the European stablished target 75%. In 2020/21, a coverage peak (49%) was observed among at-risk adults