The Centre for Health Protection (CHP) says people should make sure they are fully vaccinated against measles before travelling, after a man was hospitalised with the disease following a trip to Vietnam. The 38-year-old, who travelled to the country in early February, is now stable at Queen Elizabeth Hospital.

Although the CHP has classified the case as imported, the man stayed at the Hong Kong Sports Institute and visited its cafeteria while he was infectious.

The CHP has set up a hotline on 2125 2372 for those who may have been exposed. It will operate until Friday.

Measles cases are rising in some countries due to low vaccination rates. While Hong Kong's vaccination coverage exceeds 95 percent, international travel poses a risk.

CHP controller Dr Edwin Tsui said anyone unsure of their vaccination status, especially travellers, should consult a doctor.