SAN FRANCISCO, July 27 (Xinhua) -- Five police officers in the U.S. city of San Francisco are suspected of having A/H1N1 flu after one of them was apparently exposed to the flu virus during a recent trip to Mexico, local media reported on Monday.

    The five all work at San Francisco police department's Northern Station on Fillmore Street and all the officers believed to have A/H1N1 virus work the same shift, Capt. Al Casciato, head of the station, was quoted as saying by the San Francisco Chronicle newspaper.

    One of the officers returned from his trip to Mexico last Wednesday, and two days later he and other officers started showing symptoms. One of the officers went to the doctor and was tentatively diagnosed with the illness.

    Casciato said authorities started a "precautionary cleaning" of the station over the weekend and patrol cars are also being scrubbed.

    The five officers have been told to stay home and must be cleared by the department's doctor before they can return.

    "Right now, everybody is healthy," Casciato said. "The ones who were sick are feeling better."

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