Blood type is categorized into one of these eight groups: A-positive, A-negative, B-positive, B-negative, O-positive, O-negative, AB-positive and AB-negative. But what determines blood type and ...

Study of more than 225,000 people found some blood types appear less at risk. People with a type O blood are 12 per cent less likely to catch the coronavirus than other blood types, a study has found.

It's a bit simplistic, but you can think of the Rh factor as a protein that is either present (positive) or absent (negative) on red blood cells ... That's the theory, and quite often things ...