David Weaver
..is pretty weak at this point. There are only a few individual cases described in terms of reinfection, but given the enormous number of people in the US who have had covid, we have heard of few.

We now know a couple of dozen people who have had covid (unfortunately, some were older and are now deceased). I haven't met anyone who has had covid twice, including people who have poor habits.

I'd like to see data on two infections in one individual where a second one was due to a different variant than the first (given the large number of variants, this shouldn't be difficult).

If I'd had covid already, I'd be in no rush to get a vaccine. I haven't had it already, so I'm in a rush to get a vaccine.

I expect people will become reinfected over time, knowing little about diseases but seeing, of course that getting the flu or a cold, or in my case, bronchitis - it's not like it doesn't happen again later. So far, with the huge number of covid cases, follow-up cases with severe results are nearly unseen. I'd say rarely enough that the instances where they're mentioned could be error rate. But who knows in the short term - this is a long-term issue.

I've also seen mention that in measured reinfections, generally the second go around is asymptomatic, which is important. Asymptomatic patients are given mythical status in their ability to be super spreaders in news stories, but the data attached to actual spread probability is small for asymptomatic and much higher for someone symptomatic (this shouldn't be a surprise if the symptomatic person is sneezing or coughing).

I can only mention one case where I've seen this (there's more than this, but I don't know the people as well). My sister's kids had covid, two of them. One was symptomatic (very mild fever for one day), which triggered testing of everyone else in the family. One of the other kids was asymptomatic, but positive. The third kid, no covid. The parents, no covid. The two kids who ended up with positive tests traveled for sports and likely got infected at the same time (vs. one infecting another). It's very unpopular to mention a case like this, because two people in the same house had covid and nobody else ever tested positive (living in the same space, same rooms, etc). Why didn't they? Probably because there was no sneezing or coughing. If they had been sneezing or coughing and living in the same space, do we believe that nothing would have spread to the remaining three? I don't.

One of the biggest arguments for the vaccine in my opinion isn't that it does something to the population different than someone who has already had covid, but that it also reduces severity of infection (so far) and should for people who get covid. Less severity generally means less chance of spreading.