Testing is one of the key pillars of our response to the coronavirus pandemic. The more we know about who is infected with the virus, the better positioned we are to reduce its spread. But who should we be testing? The Australian government this week expanded its criteria for testing beyond just returned travellers and those who have had close contact with a confirmed case, to encompass people with symptoms in other high risk groups and areas. But as Raina MacIntyre writes, this new criteria doesn’t go far enough. We know a large portion of people infected with coronavirus don’t display any symptoms. So to really get a handle on the spread of the virus, we must open up testing to asymptomatic people from these groups – not just those who are sick. We’ve seen this work well in other countries like South Korea. On the topic of testing, and many other important questions relating to coronavirus, you might also like to have a listen to Michelle Grattan’s interview with Peter Doherty.