This will be particularly useful for people who don’t know if they have already had it or not, which seems to be a worrying high percentage of people. People who were asymptomatic and light cases (which is a lot of people) who knew they had already had it - if it turns out you can’t get it twice- would be able to help out others a lot.
If I knew I had already had a light case and couldn’t get it again- and can’t pass it to others- I’d be more likely to be willing to volunteer to help deliver food to people who haven’t gotten it or whatever.
