Vietnam and Burma are testing three patients for the deadly Ebola virus after they arrived from Africa suffering fever.
Two Nigerians were placed in isolation at the Tropical Diseases Hospital in Ho Chi Minh City after they flew in, Vietnam's health ministry said. They have no other symptoms.
Airline passengers sitting next to the pair who traveled via Qatar have been advised to monitor their health.
In Burma, a 22-year-old local man was taken to hospital in Rangoon after flying in from Guinea, the national Center for Disease Control and Prevention said. He is believed to have also traveled to Liberia.
Four people who accompanied the man to hospital are also being kept under observation.
The global death toll from Ebola stands at 1,229, with the bulk of cases in Liberia, Guinea and Sierra Leone.