- Cough and fever was greater in those with blood Type A
- Those with type AB blood and had COVID-19 experienced the greatest amount of dyspnea
- COVID-19 patients with type A and O blood experienced more fatigue 


Michigan State University

- 187 patients were separated into 4 different groups based on blood types (A, B, AB, O)
- Type A and Type B blood were the most common in the patients
- Those with Type A blood were at greater risk of developing COVID-19
- Those with Type O blood were at lower risk of developing COVID-19
- The data for Type AB blood is not statistically significant, since the p-value is greater than 0.05

Epidemiological relation
- The OR for Type A blood compared to other blood types came out to be 1.544, indicating a 54% increased risk of getting COVID-19
- The OR for Type O blood came out to be 0.649, indicating a 35% decreased risk of developing COVID-19


Blood Type and Risk of COVID-19

Wu, Y., Feng, Z., Li, P., & Yu, Q. (2020). Relationship between ABO blood group distribution and clinical characteristics in patients with COVID-19. Clinica Chimica Acta.

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