This publication corresponds to the Data Management Plan (DMP) for the Baseline Use Case proposed in T.5.2 (WP5) in the BY-COVID project on “COVID-19 Vaccine(s) effectiveness in preventing SARS-CoV-2 infection.” This use case aims to investigate the real-world effectiveness of SARS-CoV-2 primary vaccination compared to partial or no vaccination in preventing SARS-CoV-2 infection in virtually all resident populations spanning different countries. The study will be conducted in two sequential stages, expanding the exercise to several countries/regions: Stage I (pilot): Aragon (Spain) and Belgium. Stage II: Aragon (Spain), Belgium, Austria, Finland, Norway, Estonia and The Netherlands. The participation of these countries/regions is conditional on data access. A brief structured description of the research question, the proposed study design, and the cohort definition is provided below. Research Question: “How effective have the SARS-CoV-2 vaccination programmes been in preventing SARS-CoV-2 infections?” Intervention (exposure): COVID-19 vaccine(s) Outcome: SARS-CoV-2 infection Subgroup analysis: Vaccination schedule (type of vaccine) Study Design: An observational retrospective longitudinal study to assess the effectiveness of the COVID-19 vaccine(s) in preventing SARS-CoV-2 infections using routinely collected social, health and care data from several countries. A causal model was established using Directed Acyclic Graphs (DAGs) to map domain knowledge, theories and assumptions about the causal relationship between exposure and outcome. Cohort definition: All people eligible to be vaccinated (from 5 to 115 years old, included) or with, at least, one dose of a SARS-CoV-2 vaccine (any of the available brands) having or not a previous SARS-CoV-2 infection. Inclusion criteria: All people vaccinated with at least one dose of the COVID-19 vaccine (any available brands) in an area of residence. Any person eligible to be vaccinated (from 5 to 115 years old, included) with a positive diagnosis (irrespective of the type of test) for SARS-CoV-2 infection (COVID-19) during the period of study. Exclusion criteria: People not eligible for the vaccine (from 0 to 4 years old, included) Study period: From the date of the first documented SARS-CoV-2 infection in each country to the most recent date in which data is available at the time of analysis. Roughly from 01-03-2020 to 30-06-2022, depending on the country. This DMP follows the guidelines and principles of the BY-COVID - Deliverable 8.2.2 Project Data Management Plan.

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