Raina MacIntyre, head of the Biosecurity Research Program at Australia’s University of New South Wales, said it was well known the coronavirus can be infectious even if a patient has no symptoms.

“The Japanese tested over 500 of their first evacuees from Wuhan, whether they were symptomatic or not, and five out of eight positive tests were in asymptomatic people,” MacIntyre said. “So, in a high risk setting, it would be important to check for infection in everyone.” READ MORE