Most coronavirus cases seen globally feature a specific genetic mutation called D614G which is different to the original strain that emerged in Wuhan last year and experts feared was more infectious than the original version.īut UCL researchers looked at more than 46,723 cases of Covid-19 from 99 countries and assessed how mutations appeared and if they altered transmissibility. The figures for all infections, not just deaths, are 26 per cent and 38 per cent for type O and type A, respectively.Ĭoronavirus has not mutated to become more infectious, according to a scientific study that debunks a widespread theory. Under normal conditions just 32 per cent of people are type O. In the study cohort, 52 of the people who died were type O, making up a quarter of all deaths. In the healthy Wuhan population, a city of 11 million people, 34 per cent of people are type A.
Of the 206 patients in the study who died, 85 had type A blood, equivalent to 41 per cent of all deaths. Researchers assessed 2,173 people who had been diagnosed with the coronavirus, including 206 people who died after contracting the virus, from three hospitals in Hubei.Īcademics compared the data of the infected Wuhan patients with 3,694 non-infected people in the same region. The findings align with previous research from China which found a similar protective effect of certain blood types. 'In this study, which was done within a universal health care system with widespread SARS-CoV-2 testing, O and Rh− blood groups were associated with a slightly lower risk for SARS-CoV-2 infection as well as severe COVID-19 illness or death,' the researchers write in their study, published in the journal Annals of Internal Medicine. Those with blood type B are at 21 per cent higher risk for severe illness following infection than those with type A. 'There were 1,328 cases of COVID-19 with severe illness or death, with higher probabilities among AB and B blood groups as well as those who were Rh+,' the researchers write. Infection is five per cent less likely in type O than A, but when compared to all blood groups, this grows to 12 per cent, the researchers found. Statistical analysis accounted for all other variables and comorbidities and found the adjusted relative risk for SARS-CoV-2 infection is 15 per cent higher in type AB than in type A.
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