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Those CoVid-infected patients with blood group O were more than 4 times more likely than non-Group O patients to develop symptoms of long CoVid.  Spanish investigators report this finding after analyzing 121 subjects who suffered mild CoVid infections.  Of the total, 36 had developed post-CoVid syndrome.  The study period covered April to September, 2020 when the original CoVid strain was predominant.

 

The group studied had a mean age of 45.7 years and 56.2% of them were women.  Those with blood group O represented 43.3% of the total.  The prevalence of long CoVid by blood group was: 43.2% -O; 25% -A; 25% - B; and 16.7% - AB.   Blood group O patients were 4.2 times more likely to have long CoVid compared with non-O patients, suffered a larger number of symptoms particularly muscle pain, had more inflammatory markers, and had lower levels of protective antibodies.

 

This result is somewhat surprising, since other studies have shown that Group O persons are less likely to contract CoVid.

 

https://www.medrxiv.org/content/10.1101/2022.03.10.22272197v3.full.pdf+html

 

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