The Centre for Health Protection is investigating a cholera case involving a 29-year-old Shenzhen woman, who visited Thailand with her Hong Kong husband from September 27 to October 1.

The woman came down with diarrhea and vomiting on October 1 and was admitted to a Shenzhen hospital the next day. She is hospitalised and in stable condition. Tests conducted yesterday showed she hadVibrio cholerae O1 El Tor Ogawa. Her close contacts in Shenzhen showed no symptoms.

Her 49-year-old husband, living in Hong Kong, also had diarrhea and vomiting on October 1 but the symptoms subsided. He was admitted to Princess Margaret Hospital today for observation.

As the couple joined the Thailand tour in Hong Kong, the centre is tracing the other 29 tour members and will put them under medical surveillance. Preliminary investigation showed that the other members did not have symptoms.