The Centre for Health Protection is investigating two food poisoning clusters involving seven people.
The first involves a man and four women, aged 30 to 42, who fell ill after having dinner at a restaurant in Yuen Long on August 2.
Four of them sought medical attention and did not require hospitalisation.
The other cluster comprises a man aged 50 and a woman aged 46, who fell ill after eating at the same premises on the same day.
Both sought medical attention but did not require hospitalisation.
All are stable.
