Type O blood group associates with higher anti-JC polyomavirus antibody levels.

Brain Behav · 2021 · PMC8413794 · PMID 34291599

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a nonsignificant trendno p-value reported

Of the 62 patients with PML, 29 (47%, 95% confidence interval (CI) 35%–59%) were of blood group O, which showed a nonsignificant trend to differ from the expected distribution in the German population (41%), and the MS controls studied (36%, 95% CI 25%–48%).

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