Prior Covid offers less protection vs Omicron; mRNA booster shot efficacy declines within months

Test tube labelled "Covid-19 Omicron variant test positive" is seen in this illustration picture taken January 15, 2022.

The following is a summary of some recent studies on Covid-19. They include research that warrants further study to corroborate the findings and that has yet to be certified by peer review.

Previous Covid-19 less protective against Omicron variant

The immune response to Covid-19 helps protect against reinfection, but that protection is weaker against Omicron than it was against earlier variants of the coronavirus, according to new data.