1/ New study by Harvard research on "the relationship
between the percentage of population fully vaccinated and new COVID-19 cases across 68 countries and across 2,947 counties in the US."
2/ Key finding 1:

"At the country-level, there appears to be no discernable relationship between percentage of population fully vaccinated and new COVID-19 cases in the last 7 days."
3/ Key finding 2:

"There also appears to be no significant signaling of COVID-19 cases decreasing with higher
percentages of population fully vaccinated."
4/ What does it mean?

It means there is not a statistically significant correlation between vaccination rates and Covid cases.
5/ Limitations:

It looks only at simplistic correlations and fails to account for any potential confounding factors.

It does not address Covid hospitalizations or Covid deaths.

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