On March 17, 2020, just when the virus was spreading in the UK and before the first blockade was introduced, MailOnline reported that Chinese researchers found that people with Type A blood are significantly more likely to get coronavirus than those with Type O.
The Wuhan study also found that people with Type A blood are more likely to die from COVID-19.
In the general population, Type O blood (34%) is more common than A (32%).
However, among COVID-19 patients, people with Type O accounted for only 25%, while Type A accounted for 41%.
People with Type O blood accounted for a quarter (25 percent) of deaths in the survey. Typically, Type O people make up 32 percent of people in Wuhan.
Researchers in China evaluated 2,173 people who were diagnosed with the coronavirus, including 206 people who died after contracting the virus, from three hospitals in Hubei.
Academics compared data from infected patients in Wuhan to 3,694 uninfected people in the same region.
Of the 206 patients who died in the study, 85 had type A blood, equivalent to 41 percent of all deaths.
In the healthy population of Wuhan, a city of 11 million, 34 percent of people are type A.
In the study cohort, 52 of the people who died were type O, representing a quarter of all deaths. Under normal conditions, only 32 percent of people are type O.
The numbers for all infections, not just deaths, are 26 percent and 38 percent for type O and type A, respectively.
In November 2020, MailOnline reported again in a similar study, which found that people with type A blood are most at risk.
Researchers at the Institute for Clinical Evaluative Sciences in Toronto studied 225,556 people who had a blood test between 2007 and 2019 and a Covid swab in 2020.
The study found that people with type O blood are 12 percent less likely to get the coronavirus than other blood types.
He also revealed that those with a negative blood type (O-, A-, B- or AB-) are, on average, 21 percent less likely to catch the virus than people with a positive type.
Individuals with type O or negative blood are also 13 percent and 19 percent less likely to develop severe symptoms or die, respectively.
In the UK, about 15 percent of the population has a negative blood type and almost half (about 48 percent) are O type.
About one in eight people (13 percent) are O-, who are 26 percent less likely to become infected and 28 percent less likely to develop severe symptoms or die.