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After researching a bit and finding this: https://yourlocalepidemiologist.substack.com/p/israel-50-of-...

I'm wondering whether this number is a population-level observational result that has more to do with someone ignoring base rates rather than delta actually being much better at causing infection.

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Re: downvotes: is there good reason to believe this interpretation is definitely wrong? I wasn't able to find any details on where this number came from, and while I'd like to give Israel's public health officials enough credit that they wouldn't make this mistake, I'm hesitant to actually do that without more than a few mystery meat "percent effectiveness" numbers.

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