NARITA, Chiba Pref. (Kyodo) A woman aboard a Northwest Airlines flight that arrived Thursday at Narita International Airport from Los Angeles has tested positive for influenza in a preliminary examination, sources with the airport operator said.

The 25-year-old Japanese woman was transported from the airport by ambulance to Japanese Red Cross Narita Hospital. She walked into the hospital accompanied by quarantine officers in protective suits.

Further tests were being performed Thursday evening, with the results expected by Friday morning, the health ministry said.