Chat about Novel Coronavirus - 2019-nCoV - COVID-19

Semi-immune? On my days.

There's some truth in that when looked at in individual case (the rest of that post is bollocks though).

Immunity is not binary.

Vaccination often provides a very strong immunity, but this can decay over time, hence the need for booster shots for example.

Acquired immunity will vary in strength so whilst you might never get seriously ill again you could be hit with repeated bouts of milder symptoms.

There's no data yet (and won't be for a long time) on how acquired immunity is turning out for Covid-19. For most diseases acquired immunity is more than good enough for the vast majority of the population.