BACOLOD CITY, Philippines—Two male American missionaries were admitted on Sunday to a regional hospital here for possible influenza A (H1N1) infection, a local health official said.

Department of Health regional director Ariel Valencia Sunday said the missionaries, aged 20 and 53, had fever when they were admitted to the Corazon Locsin Montelibano Memorial Regional Hospital for observation.

Valencia said the two, who arrived in the Philippines last Tuesday and in Bacolod on Wednesday, went into self-quarantine at their staff house.

They developed fever on Friday, underwent checkup and were admitted Sunday, he added.

Meanwhile, Bacolod City Mayor Evelio Leonardia urged city residents to remain calm. "This is a continuing watch and there is no cause for panic at all," he said.

The Bacolod City government might use some of its calamity fund for its continuing H1N1 education and information campaign monitoring, he added.

So far, Negros Occidental has only one confirmed H1N1 case, a 17-year-old student of De La Salle University in Manila who had fever when she returned to Bacolod City after the university suspended its classes.

She was confined at the CLMMRH but she already recovered and was released Friday. The DoH said the people whom she was in contact with were not infected.