This is a fascinating paper by @EpiEllie and team. The available high-quality evidence shows "no evidence to support the conclusion of the existence of a biological relationship" between blood type and COVID-19 risk medrxiv.org/content/10.110…
For those who remember, the headlines claiming that there was a relationship were numerous and, it appears, incredibly misleading 
Just goes to show how easily bad science can cause serious, long-term beliefs and research investment, and it takes months of effort to even make a dent in terms of correction
For example, this study was rated at very high risk of bias in the review
42,000 accesses, 144 citations per Google Scholar, Altmetric of 1,389
42,000 accesses, 144 citations per Google Scholar, Altmetric of 1,389
In comparison, the excellent review by @EpiEllie
1,600 accesses, no citations, Altmetric of 31
That is THE WRONG WAY AROUND
1,600 accesses, no citations, Altmetric of 31
That is THE WRONG WAY AROUND
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