[Quality_Not_Quantity]

I just read that the virus attacks one or more of the types of hemoglobin molecules; it is those that the lungs usually help deal with, except that the sheer quantity of them overwhelms the lungs.

[Robert DeLong]

No, follow the link provided in post#4 above yours.

[Styria]

Hemoglobin is contained in red blood cells, which do not have a nucleus (not after 1-2 days, anyway) nor the ability to assemble proteins, so attacking RBCs or hemoglobin would be a losing strategy for a virus. No ability to reproduce.

Malaria does infect red blood cells and hide in them, however, so there could still be a link to hydroxychloroquine through that.

[GOPJ]

...patients with more normal-looking lungs, but low blood oxygen, may also be especially vulnerable to ventilator-associated lung injury, where pressure from the air that’s being forced into the lungs damages the thin air sacs that exchange oxygen with the blood.

Messy disease...