HONG KONG, April 3 (Xinhua) -- Hong Kong Center for Health Protection (CHP) of the Department of Health is investigating a confirmed case of Enterovirus-71 (EV71) infection involving a 34-year-old woman, CHP said here Friday.

    It is the 12th case in 2009, and people have been urged to be vigilant against the disease.

    A CHP spokesman said the woman presented with diarrhea, oral ulcers and vesicular lesions over her hands on March 30.

    She sought medical treatment on March 30 and did not need hospitalization. Her current condition is stable. Her stool specimen tested positive for EV71. Home contacts of the patient had no symptoms of the disease, the spokesman said.

    The spokesman said that CHP will closely monitor the situation and advise people to observe good personal and environmental hygiene.

    There were 16 cases of EV71 in 2006, 12 cases in 2007 and 98 in 2008.