Sixty-eight doctors at the Regional University Hospital of Málaga have been diagnosed with COVID-19, according to the Regional Government of Andalusia.
Health officials said they were investigating the source of the infection and found the 68 people attended the Christmas party on December 1, which included 173. The victims showed mild symptoms.
Health officials said all the COVID-19 patients had had antigen tests or a third booster shot before attending the party.
Another possible source of infection could have been a big meal for the staff of the hospital, authorities said.
Prime Minister Pedro Sánchez has warned people to be on the lookout for coronavirus infection before Christmas.
“We must not reduce our security,” he told reporters in Madrid.
The Andalusian health authorities have advised the staff of other public and private hospitals not to attend the Christmas celebrations.