Prior COVID offers less protection vs Omicron; mRNA booster shot efficacy declines within months
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.
A NURSE prepares a dose of the COVID-19 vaccine as the new Omicron variant spreads, in Dutywa, in Eastern Cape province, South Africa this week.(photo credit: SIPHIWE SIBEKO/REUTERS)ByREUTERS
