Association between COVID-19 Infection or Vaccination Outcomes and Methylenetetrahydrofolate Reductase Gene Polymorphism: A Systematic Review of the Literature.

J Pers Med · 2023 · PMC10744904 · PMID 38138914

Europe PMC DOI

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a clear trendno p-value reported

conducted a retrospective observational study and concluded that there was a clear trend toward a connection between the worldwide prevalence of MTHFR 677 T and COVID-19 incidence and mortality.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.