3) Both may (I suspect do, at least for England) include those admitted for non-COVID causes and thus make hospitalization rates look higher (because Omicron is contagious enough that many people in hospital have it unrelated to their admission)
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(Also: 65+ in SA is not only smaller proportion of the population, likely healthier compared to same-age peers here—survival bias, frankly. Don’t think we have strong signal about that age group yet, plus they need antibodies more than younger people away from immunosenescence.)
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All this was easier to figure out, when world was more uniform, everyone immunonaive. Now with such varying levels of prior infection and/or vaccination, not easy to disentangle all this from looking elsewhere, especially at the speed with which it is spreading…
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I'm a bit confused by your reference to Vietnam as the country has executed a remarkably efficient immunization program in recent months, and has now immunized 70.4% of the total population.
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