<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=799546403794687&amp;ev=PageView&amp;noscript=1">

Booster shots essentially amplify those same benefits, says Ross Kedl, a professor of immunology and microbiology at the University of Colorado School of Medicine. He says booster-induced protection against severe illness holds up over time against every known Covid variant and subvariant, including BA.5.