So sorry to hear that. Wishing he pulls through.Wife's friend is an ER doc in Seattle and former Big 10 football player and he's on a ventilator right now fighting for his life. He's only 45 and was otherwise very healthy.
Do you know if he is overweight/obese?
Other thought is he may be exposed to high viral loads given his line of work putting him at higher risk. As someone who has friends, colleagues, and relatives who work in ERs and ICUs, this concerns me, especially with reports of PPE running low at hospitals already.