Omicron boosters provide some protection against mild illness from Covid XBB subvariants, CDC says
's omicron booster shots reduced the risk of mild illness from the XBB family of subvariants by about 48% compared to people who did not receive the vaccine, according to a study from the Centers for Disease Control and Prevention.
CDC officials, in a call with reporters Wednesday, said the study results are reassuring because people who received the boosters had more protection than those who did not. Protection against severe illness should be even higher, they said. "What we know from past experience is generally that the vaccines protect better against more severe disease," Link-Gelles said. "So these are estimates for symptomatic infection and we would expect that similar estimates for hospitalization and death would be higher."
People who only received the original shots generally got their last dose about 13 months ago. They had very little protection against mild illness as a consequence, due to waning immunity observed with the old vaccines, according to CDC officials.
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