DNA genotyping of the ABO gene showed a significant association of the A-group (A1/A2 variants) with severe COVID-19.

Anti‐A isohaemagglutinin titres and SARS‐CoV‐2 neutralization: implications for children and convalescent plasma selection

(2020) Daniele Focosi   BRITISH JOURNAL OF HAEMATOLOGY

ABO blood groups are not associated with risk of acquiring the SARS-CoV-2 infection in young adults

(2020) Laurys Boudin et al.   HAEMATOLOGICA

Genomewide Association Study of Severe Covid-19 with Respiratory Failure

(2020) David Ellinghaus et al.   NEW ENGLAND JOURNAL OF MEDICINE

ABO Blood Group Correlations With COVID-19: Cohort Choice Makes A Difference

(2020) Daniele Focosi et al.   CLINICAL INFECTIOUS DISEASES

ABO Blood Group and Risk of Thromboembolic and Arterial DiseaseCLINICAL PERSPECTIVE

(2016) Senthil K. Vasan et al.   CIRCULATION

Blood Groups in Infection and Host Susceptibility

(2015) Laura Cooling   CLINICAL MICROBIOLOGY REVIEWS

Inhibition of the interaction between the SARS-CoV Spike protein and its cellular receptor by anti-histo-blood group antibodies

(2008) Patrice Guillon et al.   GLYCOBIOLOGY

Novel Association of ABO Histo-Blood Group Antigen with Soluble ICAM-1: Results of a Genome-Wide Association Study of 6,578 Women

(2008) Guillaume Paré et al.   PLoS Genetics