Covid-19 opens up your immune defense for further infections.
Immunological dysfunction persists for 8 months following initial mild-to-moderate SARS-CoV-2 infection. Considering that a this is what most of those who catch Covid-19 experiences, this is pretty alarming. And since the first Omicron wave, many Europeans and Americans has caught it 2-3 times during 2022. And there is no reson to believe this pattern of repeated infections will change during 2023 without mitigation measures. Catching Covid twice or more per year likely leads to a downward spiral for the immune system.
Covid-19 kills and exhausts T-cells and B-cells that form the base for our immune system.
More and more proof sees the light of day that Covid-19 at least to some degree affects T-cells and either kill them or exhaust them. This is bad news as we have a finite number of T-cells and it also means that the more Covid-infections we have, the fewer working T-cell we will have.