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phatspatt t1_j9t24ud wrote

they cut off their regression 99 days post vaccination, i dont think they say why other than vsccine effects "wane with time"

they also were not powered to look at moderate or mild symptoms due to confounders.

"Bivalent boosters provided substantial additional protection against severe omicron infection in persons who had previously been vaccinated or boosted, although the effectiveness waned over time. The effectiveness of bivalent boosters was higher than that of monovalent boosters."

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FartOfGenius t1_j9teob6 wrote

I think the 99 days was just to provide the same amount of time for comparison between the monovalent and bivalent cohorts

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