Associated Press - June 7, 2009 4:44 PM ET

NEW ORLEANS (AP) - New Orleans Mayor Ray Nagin and his wife have been placed in quarantine after a passenger on their flight to China exhibited flu-like symptoms.

Nagin's press office said a passenger had "signs and symptoms of an influence-like illness suspected to be of the H1N1 subtype." This comes amid continued global concerns about swine flu.

The office said Sunday the couple and a security guard were placed under quarantine in Shanghai as a precaution and were exhibiting no symptoms.

Nagin left for China Friday for an economic development trip. He was then to travel to Australia, where he'd planned to speak on climate change and sustainable building, but his office said those plans could change.

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