An epidemiologist says testing for Covid-19 should include those who show no signs of the virus.

The Government has opened up testing to those with symptoms who haven’t had a history of travel or exposure to someone with the illness.

Auckland University epidemiologist Simon Thornley says told Mike Hosking widening the net is very important.

"In Iceland, there's been a large number of asymptomatic people who've tested positive for the virus, but  have had no contact with a known case."

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