In a tweet on Monday, the microbiology and infectious disease service of the Gregorio Marañón hospital said that the sequencing of samples from the patient earlier in the day showed that the infection corresponded with omicron.
The hospital said that the patient is in good condition.
In a statement, health authorities in the Madrid region identified the patient as a 51-year-old man who had returned from South Africa on Nov. 28 after having made a stopover in Amsterdam.
He had first tested positive for coronavirus in a screening with antigen tests at the Madrid airport, the statement said, adding that authorities are watching other passengers who came in close contact with him on the plane from the Netherlands.
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