There are eight common blood types: A positive, A negative, B positive, B negative, O positive, O negative, AB positive and AB negative. But which is the rarest? Here's what to know. Start the day ...

The ratio of patients with type AB blood who had serious cases of COVID-19 was found to be 1.4 times higher than that for people with AB blood in the second group.

Did you know that your blood type ... of the types and donation compatibility: A+ Can donate to: A+, AB+ Can receive from: A+, A-, O+, O- A- Can donate to: A+, A-, AB+, AB- Can receive from ...