Supported claims: The authors describe (a) multiple pandemic βwavesβ over ~9 months and (b) a distinctive mortality pattern: besides high mortality in the very young and elderly, they report a third peak in βhealthyβ young adults (age 20β40), yielding a βW-shapedβ curve.
Mechanistic emphasis: The paper contends that most excess deaths involved bacterial bronchopneumonia (common organisms listed), while ARDS-like primary viral pneumonia is βprobably a minority,β and it frames secondary bacterial invasion as a downstream driver of lethality.
Epistemic humility (what remains under-identified): It repeatedly notes that several key causal questions (especially why young adults died disproportionately; how many deaths were truly primary viral vs secondary bacterial) remain unresolved, due to limits of historical records and incomplete direct measures of host/environmental determinants.
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