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1. There has been lots of talk about recent data from Israel that seem to suggest a decline in vaccine efficacy against severe disease due to Delta, waning protection, or both. This may have even been a motivation for Biden's announcement that the US would be adopting boosters.
2. While I 've not spent enough time with the raw data to be willing to make absolute claims, I suspect this apparent decline may be an artifact; I think we can explain why; and I think this needs to be looked at seriously. @jsm2334 laid out the argument: https://www. covid-datascience.com/post/israeli-d ata-how-can-efficacy-vs-severe-disease-be-strong-when-60-of-hospitalized-are-vaccinated …