ADDIS ABABA, Ethiopia — As the 9 a.m. flight from Dubai arrived at the international airport in Ethiopia’s capital on Wednesday, four government health specialists in face masks and protective glasses worked their way to the line of incoming passengers to check their passports.

The health specialists found what they were looking for — two passengers who had just returned from China — and pulled them aside to check their temperatures to see if they might have been infected by the coronavirus.

The two passengers had normal temperatures, so were allowed to continue on their way, a government policy that does not account for an incubation period that is up to 14 days.

As the coronavirus wreaks havoc in China and has spread to countries around the world, experts are increasingly concerned that Africa is particularly vulnerable.