“This updated version of the vaccine does not target the now-dominant KP.3.1.1 strain, and instead focuses on that variant’s immediate predecessors, including a strain known as KP.2. That strain was more prevalent when work began on the new formulation; long development times make it difficult for drug makers to pivot to target each new variant.
“Evolution doesn’t stop and let us catch up,” Amesh Adalja, senior scholar at the Johns Hopkins Center for Health Security, told Vox. “Evolution is always moving, and there’s some unpredictability of where the virus may go.”
Still, scientists believe the new drug will provide the public with at least some increased measure of protection against severe sickness, including against the latest variants. And it could offer some protection against infection since it targets the close relatives of the current dominant variant.”
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“The CDC recommends that everyone age 6 months and up get one dose of the new vaccine, regardless of their previous vaccination status, and has stressed the importance of high-risk individuals keeping up with the latest vaccines. Other countries like Canada and the UK recommend that only those with high risk of hospitalization, serious illness, or death from the virus get inoculated.”