>I don't know about the long-term effects but I am pretty certain that reinfections are very rare.

There are 4 endemic coronavirus strains that circulate through out the community. Immunity to those is hypothesized to be a 1 year time frame. Covid19 is probably going to be similar. The game changer is the vaccine which may cause a more durable and longer term immune response.

Mechanistically reinfection is possible even with a vaccine but you may be asymptomatic or the disease course may be innocuous and the infectious period reduced. This is what reduces the Ro value below 1.