BEIJING, May 13 -- China's Ministry of Health has ordered heightened monitoring of seasonal flu, and the prompt notification of A/H1N1 influenza cases to the ministry, in the wake of the first confirmed A/H1N1 case on the mainland.

    All China's provinces, municipalities and autonomous regions on the mainland must monitor seasonal flu year round, said the ministry on Monday.

    All city-level disease prevention and control authorities, and at least one comprehensive hospital in every city, must set up monitoring departments, the ministry ordered.

    Suspected or confirmed cases of A/H1N1 flu must be reported to the ministry within two hours of discovery, it said.

    The development came hours after China confirmed a mainland male, surnamed Bao, who recently returned from the United States, tested positive for the A/H1N1 influenza.

    It was the first such case on the Chinese mainland. According to the health ministry, Bao is currently "recovering with a normal body temperature", and is "in good spirits".

    "Given the increasing number of A/H1N1 cases worldwide and the frequent international exchanges, it is inevitable for the virus to enter China," the teleconference said.

    The country's health authorities at all levels from Monday were looking for passengers who had traveled on the same flights as Bao to Beijing and Chengdu.

    By Tuesday morning, 201 of all 233 passengers who arrived in Beijing on board the Northwest Airlines flight NW029 on May 9 had been put under medical observation, said the health ministry.

    A total of 10 crew members and 150 passengers were on board the Sichuan Airlines flight 3U8882 with Bao from Beijing to Chengdu the same day.

    Among them, two people could not be reached by Tuesday, while the rest were under medical observation, said the ministry.

    Xinhua News Agency correspondents reporting from Beijing (XHTV)