[TRENDING: Woman stranded from home for 8 months | Video shows mountain lion stalking hiker | Moon rules: Must come in peace]A Canadian study found among 95 patients critically ill with COVID-19, a higher proportion with blood type A or A/B needed mechanical ventilation compared with patients with blood group O or B.The research gives further evidence blood type may play a role in someone’s susceptibility to infection and just how serious their illness is.The reasons for this link aren’t clear and experts say more research is needed..