They did a prospective study of vaccine effectiveness vs infection and transmission among vaxxed healthcare and frontline workers. Seems biased from the start.

They did a prospective study of vaccine effectiveness vs infection and transmission among vaxxed healthcare and frontline workers. Seems biased from the start. Won’t it be confounded by their tendency to wear (better) PPE? Edited to add: I suppose it depends on their methodology. Quick glance at Thompson’s study, seems they compared vaxxed HCWs to unvaxxed HCWs. I don’t know if we would expect to see material PPE-wearing differences between those groups.