Blood type O may offer some protection against COVID-19, two studies suggest

Type A at more risk; mechanisms poorly understood

By Derek Staahl
October 16, 2020

SAN DIEGO (KGTV) — Two new studies published this week suggest people with blood type O have a lower likelihood of catching COVID-19 and developing severe illness than people with other blood types.

Blood type is a characteristic we inherit from our parents and there are four major blood groups: A, B, AB and O.

Danish researchers looked at nearly 500,000 people who tested positive for COVID-19 and found that people with type O were underrepresented.

In a study published in the journal Blood Advances, the researchers found 38.4 percent of those infected had type O when that type actually makes up 41.7 percent of the population in that area.

The researchers say the findings suggest people with type O are less likely to get infected in the first place.

On the other hand, the team found that people with type A blood were overrepresented: 44.4 percent of those infected had type A compared to an expected value of 42.4 percent. The researchers suggest people with type A might be more at risk.

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