Paul O Mahoney
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I would think that it's a percentage of the population who have received vaccines, the effectiveness of various vaccines might have a positive effect in the longer term .Question regarding “herd immunity”.
Say one country, which is using Pfizer only (95% effective), is said to have achieved HI when X% of the population have received (both) jabs.
Then another country, which is using J&J only (66% effective) is said to have achieved HI when Y% of the population have received (single) jabs.
Is Y greater than X because J&J is less effective?
(In both cases the people have received the “full course”, ie ignore the number of required jabs.
Suppose what's the definition of herd immunity is also a factor.