Authorities in Spain’s Basque Country are investigating a public health incident in which 253 expired vaccine doses were administered to both infants and adults over the past two months. The expired doses involved the hexavalent vaccine, which protects against diphtheria, tetanus, pertussis, Haemophilus influenzae type B, polio, and hepatitis B—a routine part of infant immunization schedules. According to the Basque health system, Osakidetza, the expired vaccines are not considered harmful, and no adverse effects have been reported among recipients. However, EH Bildu criticized the health service for systemic failures in monitoring expiration dates, noting that some patients reportedly received two expired doses. This incident marks the second vaccine-related controversy in the Basque Country within four months.