Blood type and COVID-19 risk: O may help, A may hurt

The evidence of a role for blood type is “tentative … it isn’t enough of a signal to be sure,” said Dr. Eric Topol, head of the Scripps Research Translational Institute in San Diego. Most genetic studies like this are much larger, so it would be important to see if other scientists can look at other groups of patients to see if they find the same links, Topol said.Being older or male seems to increase risk, and scientists have been looking at genes as another possible “host factor” that influences disease severity.During the outbreak of severe acute respiratory syndrome, which was caused by a genetic cousin of the coronavirus causing the current pandemic, “it was noted that people with O blood type were less likely to get severe disease,” he said.

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