Canada's top doctor says there isn't enough evidence to back herd immunity as a way to reopen society, as Quebec's premier is considering the approach to restart his province's economy. Earlier today we tweeted about a new WHO scientific brief on "immunity passports". 'More caution'Legault is not alone in searching for solutions to reopen his province's economy, as nationwide shutdowns pass the one-month mark. The federal government has committed millions of dollars toward a new COVID-19 immunity task force focused on researching immunity testing and developing a vaccine — something Tam said is still in its early stages. 0:42'Immunology' of the virus not knownAllowing people with protected immunity status back into society has captured international attention, with countries like Chile moving to issue "immunity passports" to those who have recovered from the virus.

Source: CBC News April 25, 2020 22:36 UTC