Population surveys seeking to find out how widespread asymptomatic Covid-19 cases really are show that a herd immunity strategy might struggle, Marc Daalder reports. But when researchers allowed anyone who wanted a test to get one, just 0.8 per cent tested positive. While this is significant, it is also far from enough for herd immunity in a city that has already seen 15,000 deaths and 141,000 confirmed cases. "My first go-to for herd immunity is, until we've got a vaccine, we won't achieve herd immunity. Paynter agreed, saying that the survey results she had reviewed were not promising for herd immunity advocates.

Source: Stuff April 26, 2020 22:52 UTC