ABO and COVID-19: In a study of over 2000 infected patients from Wuhan, China, it was noted that group A phenotype was found more frequently than expected in patients with COVID‐19, whereas group O occurred less commonly than expected in the general population, suggesting that group A individuals are at greater risk from COVID‐19 than those of group O. This observation led us to undertake a study of the association of blood group polymorphisms (ABO and secretor status) with COVID‐19 severity in hospitalized patients in Bristol, UK.