Two Ebola suspect Nigerians, who arrived at Tan Son Nhat International Airport in Ho Chi Minh City on August 19, have been discharged from hospital but remain being tracked in the community within the next 21 days.

The male passengers were isolated at the municipal Tropical Diseases Hospital after they were detected to run a slight fever of 37.5-38 degrees Celsius by a body temperature measurement machine installed at the airport upon their arrival.

Both got rid of fever and showed no other typical symptoms that could be tied to the deadly virus after being watched by the medical staff over the past 24 hours, according to the Preventive Medicine Centre.

The men left Nigeria , one of the four West African countries being affected by the epidemic, on August 18. They were on a Qatar Airways flight to Viet Nam the following day.

Early Ebola symptoms include sudden onset of fever, weakness, muscle pain, headaches and a sore throat. They later progress to vomiting, diarrhoea, impaired kidney and liver function – and sometimes internal and external bleeding.

No infection of the virus has been reported in Viet Nam so far.