A Spanish study about Covid risk factors during lick down. Doesn't tell us a lot given the limitations of an online survey, but I wonder if a sample where 70% disinfect their shopping is typical? I don't think anyone did that here.

The only paper I found that does a first principle mask study with live covid. Mannequin heads with fitted pumps and masks. Finds that surgical masks lead to about 50% lower virus counts detected, twice that if both source and detector are equipped. A lot less if they use N95s.

A study from Bavaria that finds a six times higher prevalence among kids (1-18) in a diabetics screening program than in official data.