Several travellers from China had recently arrived in Sarawak and underwent mandatory quarantine as well as RT-PCR testing. Despite already being given two doses of a Covid-19 vaccine in their home country, they tested positive for the disease.

National Covid-19 Immunisation Programme Coordinating Minister Khairy Jamaluddin said such cases have prompted a rethink of how Malaysia would reopen its borders in the future.

The minister said that despite being fully vaccinated, tests found...