A few people infected by the coronavirus become seriously ill, while others show little to no signs of the symptoms, or are asymptomatic. Recent researches are pointing to the fact that the ABO blood group might play an important role in a person’s susceptibility and severity of COVID-19 infection. Aim of the study: try to understand the relationship between ABO groups and COVID-19 (susceptibility and severity). A total of (507) patients were included in this study. The study population was divided based on the ABO blood group into types A+, A−, B+, AB, O+, and O−. Blood group A was associated with high susceptibility of infection: group A, 381 (75.1%); and less common in group O, 97 (19.2%), group B, 18 (3.5%), and group AB, 11 (2.2%). The severity of COVID-19 infection was common in non-blood group O where (20 (7.1%), 4 (26.7%), 2 (11%), and 1 (9%) in type A+, A−, B+, and AB, respectively), while in type O 3.1%. And mechanically ventilated patients were 22 (5.9%), 2 (13.4%), 2 (11.1%), and 1 (1%). Mortality was high in blood groups A and B, 16 (4.37%) and 1 (5.5%), respectively, while in blood group O, it was 1%. The incidence, severity, and mortality of COVID-19 were common in non-blood group O. While blood group O was protected against COVID-19.

中文翻译：

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ABO组可在COVID-19的易感性和严重性中发挥作用

少数被冠状病毒感染的人患了重病，而其他人则几乎没有或没有任何症状或无症状。最近的研究指出，ABO血型可能在人的COVID-19感染的易感性和严重性中起重要作用。研究目的：尝试了解ABO组与COVID-19之间的关系（敏感性和严重性）。本研究共纳入（507）名患者。根据ABO血型将研究人群分为A +，A-，B +，AB，O +和O-型。甲型血与感染的高敏感性有关：甲组381例（75.1％）；甲型381例。O组97个（19.2％），B组18个（3.5％）和AB组11个（2.2％）较少见。非血液O组常见COVID-19感染的严重程度，其中（20（7.1％），4（26.7％），2（11％），分别在A +，A-，B +和AB型中为1（9％），而在O型中为3.1％。机械通气患者分别为22（5.9％），2（13.4％），2（11.1％）和1（1％）。A组和B组的死亡率很高，分别为16（4.37％）和1（5.5％），而O组为1％。非血型O组常见COVID-19的发生率，严重性和死亡率。而O型血则具有防止COVID-19的作用。