Due to the confirmation of China's first swine flu case by the Ministry of Health, authorities are urging all passengers onboard May 9's Sichuan Airlines flight 3U8882 (Beijing-Chengdu) to contact their local center for disease control and prevention or other relevant public health agencies.

Despite the best efforts so far, while most passengers who shared the same flight have been tracked down by health authorities in dozens of different provinces, but authorities are still experiencing difficulties in locating the few remaining passengers.