Medical researchers are gaining clues about SARS-CoV-2, the virus that causes COVID-19, but there are big gaps in understanding our immune response to it — how well, and for how long, we can become protected from being infected in the future.
That understanding is crucial in the push to loosen lockdown restrictions that will allow people to go back to their workplaces and gather in public.
https://www.cbc.ca/news/health/covid-immunity-unknown-1.5553229