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Should I get a COVID-19 booster? | Science | AAAS
Spain - Traveler view | Travelers' Health | CDC
La Moncloa. 07/02/2023. Government of Spain abolishes mandatory use of face masks on public transport [Government/Activity of the Council of Ministers]
Spain approves longer waiting period for booster shots after Covid-19 infection | Society | EL PAÍS English
Covid booster shot: Moderna says vaccine generates promising immune response against variants
As COVID cases rise, Spain approves booster shots for over 40s | Reuters
Countries weigh need for COVID-19 booster shots | Reuters
Effectiveness of mRNA vaccine boosters against infection with the SARS-CoV-2 omicron (B.1.1.529) variant in Spain: a nationwide cohort study - The Lancet Infectious Diseases