The Belgian government confirmed two more cases of swine flu, bringing the total there to 12.
The government's influenza task force said late Saturday a Belgian man who returned from Costa Rica on May 23 was likely infected with the A/H1N1 strain of influenza during the flight. He no longer shows any flu symptoms.
The second case is a "young man" who returned home from New York on Friday.
The flu task force said he has been hospitalized and a person he has been in contact with has been given antiviral medication.