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Pfizerand ModernAccording to a study by the Centers for Disease Control and Prevention, Omicron booster vaccines reduced the risk of mild disease from the XBB family of subtypes by about 48% compared to people who did not receive the vaccine.
A CDC study released Wednesday provides the first assessment of the actual effectiveness of micron booster vaccines against the XBB family of subvariants. Some scientists have warned that XBB sub-variants could cause another wave of Covid because they are so good at evading infection-blocking antibodies.
Speaking to reporters Wednesday, CDC officials said the study results were reassuring because people who received the boosters had more protection than those who did not. Protection against serious diseases should be even higher, they believe.
“It reduces the risk of symptomatic infection by about half at the population level,” said Dr. Ruth Link-Gelles, CDC official and author of the study.
“We generally know from past experience that vaccines protect better against more severe disease,” Link-Gelles said. “So these are estimates for symptomatic infection, and we would expect similar estimates for hospitalization and death to be higher.”
The study compared people who received a new booster shot with those who received two to four doses of the original vaccine. The boosters target micron BA.5 and the original strain of Covid that emerged in Wuhan, China, while the old vaccines only target the original strain of the virus.
People who received only the original vaccinations usually received their last dose about 13 months ago. They had very little protection against mild illnesses as a result of the waning immunity seen with old vaccines, according to CDC officials.
The XBB.1.5 sub-variant is rapidly becoming predominant in the US and currently accounts for approximately 49% of new Covid cases nationwide. World Health Organization officials have described XBB.1.5 as the most transmissible variant of the virus to date, although it does not have any mutations that would suggest it causes disease in humans more than other subvariants.
XBB.1.5 is highly immune evasive and has mutations that allow it to bind better to human cells. But the CDC study found that omicron boosters provide about as much protection against the XBB family as against the BA.5 subvariant and its descendants, such as BQ.1 and BQ.1.1.
Please, this is a developing story. Check for available updates.
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