Early in the pandemic, some reports suggested people with A-type blood were more susceptible to COVID, while those with O-type blood were less so. But a review of nearly 108,000 patients in a three-state health network has found no link at all between blood type and COVID risk..... Webmd.com, Blood Type Doesn’t Affect Your COVID Risk, Dennis Thompson, 2021
An early report from China suggested that blood type might influence COVID risk. Subsequent studies from Italy and Spain backed that up, researchers said in background notes.
However, other studies out of Denmark and the United States offered mixed and conflicting results.
To clear things up, researchers led by Dr. Jeffrey Anderson, from Intermountain Medical Center Heart Institute in Murray, Utah, analyzed data from tens of thousands of patients with Intermountain Healthcare, a nonprofit health system of 24 hospitals and 215 clinics in Utah, Idaho and Nevada.
Of those in the analysis, nearly 11,500 tested positive for coronavirus, while the rest tested negative.