As has been previously reported and most already know, the virus that causes COVID-19 changes over time. The updated COVID-19 vaccine bivalent boosters include components of the original virus strain and the Omicron variant. This updated booster is called a bivalent COVID-19 vaccine booster because it is effective against two different strains of the virus
The updated COVID-19 vaccine boosters are designed to give you broad protection against COVID-19, including better protection against the Omicron variant. Read more from the National Kidney Foundation.