- Two new studies published this week suggest that the risk of becoming infected with the new coronavirus may be related to someone’s blood type.
- One study showed that those with type O blood were less likely to catch COVID-19, while another showed that those with type O blood did not get as sick.
- More research needs to be done, and even if blood type can affect the likelihood of COVID-19 infection and serious illness, it is not enough to change someone’s behavior.
We have learned a lot about the new coronavirus since the beginning of the pandemic seven months ago, but there are still countless mysteries that remain unsolved. Dozens of studies are published weekly with viable theories about how contagious the virus is, who is most likely to be infected, how dangerous the virus can be for certain types of people, and more. Initially, several of these studies indicated that one̵
Like CNN reports, two studies published Wednesday, show that people with type O blood are less likely to catch COVID-19 and may also be less likely to become seriously ill if infected.
The first study from Denmark examined data from 473,654 that were tested for COVID-19 from February to July. 7,422 of these tests returned positive and 38% of these individuals had type O blood and 44% had type A blood. In a much larger sample of data from over 2.2 million people in Denmark who were not were tested for virus, 42% had type O blood and 42% had type A blood. These results appear to indicate that despite individuals with type O and type A blood that are evenly distributed among the general population, type O is more -lightly vulnerable to the virus.
Another study looking at 95 critically ill patients with COVID-19 hospitalized in Canada came to similar conclusions. The researchers found that of these 95 patients, 84% with type A or type AB blood needed mechanical ventilation, compared with 61% with type O or type B blood.
“As a clinician … it’s at the bottom of my mind when I look at patients and stratify them,” said Dr. Mypinder S. Sekhon, an intensive care physician at Vancouver General Hospital and author of the Canadian study. CNN. “But in terms of a final marker, we need multiple findings in many jurisdictions that show the same thing. I do not think this replaces other risk factors of severity such as age and comorbidities, etc. If one is blood type A, you don’t need to start panicking. And if you’re blood type O, you can’t go to pubs and bars. “
The two important conclusions here are that much more data is still required before final conclusions can be drawn from this study, and that even if the ABO blood type plays a role in the virus’s ability to infect or cause serious harm, it is still not enough difference to affect pandemic best practices for anyone.