They're testing about 75 teenagers who have fallen ill to make sure they're not suffering from the swine flu - a disease that has killed dozens of people in Mexico.
The city health department sent a team of doctors to attend to the ill students who attend St. Francis preparatory school. None of those sick has been hospitalized.
Officials hope to find a known human form of the flu.
Results are expected to take a few days.
As a precaution, the Queens high school will be sanitized this weekend.