The new boosters (based off XBB.1.5) should have decent efficacy against Eris (at least vs severe disease), because there are only 2 new mutations in Eris vs this variant. However the new boosters now apparently won't be available until October. The current (bivalent) iteration of the booster, based on the BA.5 variant, has far less homology w Eris, with a whopping 15 new mutations in Eris vs BA.5. This info is from Eric Topol's twitter account:
Great. Thanks so much!! I thought the new boosters would be out in September. After looking it up, the booster may indeed be approved by September.
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