re: We don't know how many people died FROM Covid, therefore can't know Vax effectiveness

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And given the widely disparate outcomes even among people of the same age group, how can "they" claim any particular effectiveness per person? You can glean a rough estimate over time (longer than a few months), but when they came out with 95% immediately upon authorization, I just shook my head. Literally no way to make that claim legitimately with this disease.

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That's not how they calculate efficacy.

Say you have 20,000 people in one vaccinated group and 20,000 people in one unvaccinated group.

If 20 people in the unvaccinated group get COVID and 1 person in the vaccinated group gets COVID, the vaccine has an efficacy of 95%.

It doesn't mean 95% of people won't get COVID if a vaccinated group was infected. It means that they're 95% *less likely* to get it.