The ongoing problem with new variants is that vaccine research has to forecast which mutations are going to be dominant by the time that the research has been undertaken. The boosters from a year ago were focused on BA5, but the latest EG5 variant quickly becoming dominant is from the XBB path. https://covid.cdc.gov/covid-data-tracker/#variant-summary
The ongoing problem with new variants is that vaccine research has to forecast which mutations are going to be dominant by the time that the research has been undertaken. The boosters from a year ago were focused on BA5, but the latest EG5 variant quickly becoming dominant is from the XBB path.
https://covid.cdc.gov/covid-data-tracker/#variant-summary