Blood Type Affect On Covid . Whether your blood group is type A, B, AB or O is based on the blood types of your mother and father. But experts warn the study, which has not been peer-reviewed, should be viewed with skepticism. Study: Blood type may factor in COVID-19 risk, severity of ... (Ricky Chambers) But experts warn the study, which has not been peer-reviewed, should be viewed with skepticism. BLOOD type was not previously a measure associated with coronavirus symptoms, but as the world has continued in its search to understand the new disease, scientists have discovered a link. Whether your blood group is type A, B, AB or O is based on the blood types of your mother and father. Like eye color, blood type is passed genetically from your parents. Overall, the findings indicate that people with Type O blood seem to be more protected and that those with Type A appear more vulnerable. People with blood type ‘O’ unl...