The link reported that doctors thought of many factors, even for history of COVID 19 infection.I don’t they looked at social behaviour...like maybe, drinking pond water, or swimming in filthy water, or even COVID vaccines. Seems like they are rounding up the usual suspects.....maybe resistant org....or temporary immunosuppression...poor kids nowadays...
Lake Mead has been siphoned down to a puddle and they are sucking up the dregs to use as drinking water. I would conjecture that there may be higher concentrations of parasites and some of the water is not being filtered completely.
Or wearing masks 24/7?🤔