City’s five cases recorded in a week are ‘from the mainland or imported from overseas’, Eric Chan says.

Cases involve 79-year-old woman who recently returned from Guangdong province’s Foshan, and father and son who travelled to Bangladesh.

Dr Joseph Tsang urges residents to be responsible and avoid travelling to high-risk areas as city records three more infections.

Case involves woman, 66, just returned from Guangdong province, while another probable patient under observation after three-country trip.

City’s five cases recorded in a week are ‘from the mainland or imported from overseas’, Eric Chan says.

Director of Health Dr Ronald Lam highlights notably shorter incubation period in mosquitoes, allowing virus to replicate quickly.