OSAKA (Kyodo) A high school in Osaka convened an assembly Saturday after two of its students and a teacher were found infected with the H1N1 swine flu Friday upon returning from Canada.

Masato Nakanishi, chief of the Osaka prefectural education board, told reporters the school in Neyagawa, Osaka, will remain open as usual because those who didn't take part in the trip are unlikely to be infected.

The two 16-year-old students and the 46-year-old teacher had been in Oakville, Canada, since April 24 for a short-term study program.

As reports emerged that the new flu was spreading in Canada, the school sent 50 masks to the students. But the students decided not to wear them because the local residents weren't wearing them either, school officials said.

The schedule for the study program hasn't been changed because no infections have surfaced in and around Oakville, according to the school and the education board.