If a person in a family gets infected, other relatives who live together under one roof usually catch it. Especially if it’s a partner with whom you share a bedroom. But this is not always the case. Sometimes some family members do not become infected despite close contact. How is it possible? Since the onset of the pandemic, several studies have examined how blood groups can contribute to whether or not someone is easily infected. Research by the University of Nantes in France, the results of which were published in the journal Frontiers of Microbiology, now again points to possible connections. The researchers found out how blood type affects coronavirus transmission in couples who lived in a household and shared a dormitory. To this end, more than 300 hospital staff diagnosed with COVID-19 in 2020 and 2021 were asked to complete a questionnaire anonymously. They had to state not only their blood type, but also whether their partner had become infected and, if so, which partner had become infected first and how long it took for the other person to show symptoms. It was assumed that there were no more than eight days between pair infections. Photo gallery (5) Source: Getty Images Infection is highest in couples with compatible blood groups Researchers have found that SARS-CoV-2 transmission was most common when partner blood groups were compatible. This means that when transfused, their blood groups match. Of the 131 couples in which one partner infected the other, 93 blood groups were compatible and only 38 were not. Of the 220 pairs who did not infect their partner, 104 were compatible and 98 were not. Therefore, the researchers believe that blood group incompatibility is also associated with a lower risk of transmitting symptomatic infection: In couples with compatible blood groups, the risk of infection was 47.2 percent. In couples whose blood groups did not match, the risk of infection was only 27.9 percent. Therefore, if their partners have mismatched blood groups, their risk of infection is 41 percent lower than that of couples with matching blood groups. These blood groups match: Blood group 0- is compatible with: 0-, 0+, B-, B +, A-, A +, AB-, AB + Blood group 0+ is compatible with: 0+, B +, A +, AB + Blood type B- is compatible with: B-, B +, AB-, AB + Blood type B + is compatible with: B +, AB + Blood type A- is compatible with: A-, A +, AB-, AB + Blood type A + is compatible with : A +, AB + Blood type AB- is compatible with: AB-, AB + Blood type AB + is compatible with: AB + Photo gallery (5) Source: TASR / Milan Kapusta People with blood type 0 are less likely to become infected Based on In evaluating the data, the researchers were also able to determine that people with certain blood types are generally affected by the infection with different frequencies and therefore have a different risk of infection. According to a French study, people with blood group 0 are less likely to become infected with SARS-CoV-2 than people with other blood groups. But, you can easily pass the virus on to others and you have an increased risk of becoming super-spreaders because blood group 0 is compatible with all blood groups. According to research, people with blood type AB have the highest risk of infection. However, they cannot transmit the virus on their own because the blood type is the least compatible with the others. Absolutely the most common are people with blood type A. This is also related to the fact that blood type is very common in the population. Photo gallery (5) Source: Getty Images Researchers at the University of Nantes have therefore concluded that compatibility, resp. blood group incompatibility affects the infection process in the population. In France, for example, 34 percent of encounters are incompatible with blood type. Therefore, the authors estimate that blood group characteristics alone prevented 14 percent of possible transmission cases. Your partner is positive for CORONAVÍRUS and you are not? The researchers found out what significantly affects whether you get infected
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