Is that a new trend with Omicron? In 2020 studies did not find a correlation with severity but did notice a correlation with detection.
https://hms.harvard.edu/magazine/skin/covid-19-severity-not-linked-blood-type
Blood type is not associated with a severe worsening of symptoms in people who have tested positive for COVID-19, according to HMS researchers at Massachusetts General Hospital. Although the findings dispel previous reports suggesting that a certain ABO blood type could lead to increased disease severity, they did indicate that symptomatic individuals with blood types B and AB who are Rh+ are more likely to test positive for COVID-19 than people with other blood types. Symptomatic people with blood type O are less likely to test positive.
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