The data presented in the Vaccine Tracker are collected through The European Surveillance System (TESSy). EU/EEA countries report weekly aggregated data on number of vaccine doses distributed by manufacturers to the country, number of first, second, unspecified and additional doses administered to adolescents and children below 18 years of age, adult population (18+), by age group and in specific target groups, such as healthcare workers (HCW) and residents in long-term care facilities (LTCF). Healthcare workers refer to individuals who work in healthcare settings who may come into contact with patients, including administrative staff, and home care staff. The number of doses distributed by the manufacturers is calculated based on the number of doses per vial defined for each specific vaccine product in the product information available on the EMA website. Additional doses refer to vaccine doses either administered as an extension of the primary series (e.g. in immunocompromised individuals) or as a booster dose in already fully vaccinated individuals.

EU/EEA countries may upload data at any time, but as a minimum they are requested to report twice a week (on Tuesdays and Thursdays). The data in the tracker are refreshed at 11h, Monday to Friday. Considering this reporting timeframe and the time ECDC needs to process the data, some discrepancies may be observed between the figures published by ECDC and the ones presented in official national reports or web sites. At country level different systems to monitor the vaccine roll out may be in place (see links to national data on vaccine rollout in the “Country profiles” tab).

The vaccine uptake is expressed as a percentage and calculated as follows: number of doses administered to the total population, adults (individuals aged 18 years and above), by detailed age groups, including below 18 years, or in specific target groups (HCW, residents in LTCF) divided by the size of the corresponding population. Uptakes are calculated separately for at least one dose and full vaccination with a primary course. For vaccine products that have a one dose vaccination course, the first dose will be the only one administered. Full vaccination is defined according to the instruction of the manufacturer as described in the Summary of Product Characteristics for each vaccine product and as authorised by EMA. Population denominators for the total population, adult population and detailed age groups are obtained from Eurostat/UN. Population denominators for healthcare workers and residents in LTCF are provided by countries. For some countries, the estimated vaccine uptake in certain age groups or population groups may exceed 100%. These data should be interpreted with caution and, when available, explanatory notes are included in the Country Disclaimers below.