Spain authorises booster COVID-19 shots for severely immunocompromised people | Reuters
COVID-19 vaccines in national stockpile starting to expire as uptake slows | CBC News
COVID passports in Spain and rest of EU to expire after 9 months if there is no booster shot - Olive Press News Spain
Madrid, Spain -10 December 2021: Approval of third COVID19 booster dose of Pfizer-Biontech and MODERNA vaccines for increased protection against OMICRON variant. foto de Stock | Adobe Stock
Spain Extends Travel Restrictions, Requires Booster Jabs for Those Vaccinated Before May 2021 - SchengenVisaInfo.com