Comment by kian

To any scientists - an anti-malarial is found to be effective against coronavirus. At the same time, initial reports are suggesting that people with type O blood have a reduced risk of infection and lower infection severity than those with other blood types. The same pattern also holds true for malaria, with type O blood having a protective and suppressive effect. If the coronavirus is getting into cells via the ACE2 receptor, why would we expect any of this other stuff to be effective? Why is an anti-parasitic working to reduce viral load? Why is the same blood type protective of both? What common mechanism of action or attack (perhaps hitching a ride on blood cells to spread through the body?) are we missing?