Nature news reports on the effort to find people who are genetically resistant to SARS-CoV-2.  The research article is here.  An excerpt from the news item:

Imagine being born naturally resistant to SARS-CoV-2, and never having to worry about contracting COVID-19 or spreading the virus. If you have this superpower, researchers want to meet you, to enrol you in their study.... The first step is to narrow the search to people who have been exposed, without protection, to a sick person over an extended period, and have not tested positive or mounted an immune response against the virus. Of particular interest are people who shared a home and bed with an infected partner — pairs known as discordant couples.

Cheers, 

Colin