[derbOac]

I'm always skeptical of these studies because I suspect there's more documentation and reporting biases in more socioeconomically stressed areas. That is, my guess is cases are less likely to be accurately documented in India than, say, the US or Germany.

Having said that, there's molecular biological evidence of cross immunity to other forms of coronavirus so there might very well be something to it.

I've wondered along these lines if keeping kids out of schools might in some ways be counter productive, by decreasing exposure to other coronaviruses or other pathogens that increase immunity.

I've often wanted to see if, eg, parents of young children, or people working with young children (teachers, pediatricians, etc) have less severe outcomes from sars-cov-2 than matched controls.