Tokyo - A Japanese woman who arrived at Tokyo's airport from Los Angeles tested positive for influenza Thursday after Japan implemented measures to prevent an outbreak of swine flu, media reports said.

   The 25-year-old passenger was taken to hospital from Narita International Airport after a preliminary test showed symptoms of influenza such as coughing and runny nose, Jiji Press said.

   The results from a thorough examination of the patient were expected Friday.

   About 20 passengers seated near her on a Northwest airplane were to be taken to another facility. If the woman tests positive for swine flu, the others would be subjected to a 10-day quarantine, Jiji said.

   There has been no reports of confirmed or suspected swine flu in Japan.

   Mexico has been the worst-hit country in the recent swine-flu outbreak with 91 confirmed infections and eight deaths although 159 people have died there recently of the flu. The United States has reported one death and 64 infections.

   Other countries reporting infections but no deaths are Canada, Britain, Spain, New Zealand, Germany, Israel, Austria, Switzerland and Peru.