Aim The aim of this study was to investigate the ABO and Rh blood group distribution and clinical characteristics in patients with COVID‐19. Materials and Methods The clinical characteristics and blood groups of 1667 patients who were hospitalised because of COVID‐19 (with a positive PCR test) between 16 March and 10 July were reviewed cross‐sectionally. Results When blood groups of patients diagnosed with COVID‐19 and control group were compared, it was observed that there was an increase in the number of COVID‐19 patients with blood groups A and AB, decrease in the number of COVID‐19 patients with blood group O, a statistically significant increase in the number of individuals with blood group A in COVID‐19 patients compared with healthy individuals, and almost significant increase in the number of COVID‐19 patients with blood group AB and a very significant decrease in the number of COVID‐19 patients with blood group O. Conclusion Our study has found that having blood group O may be protective, that blood group A may have greater susceptibility to the disease, but this does not affect the course of the disease and is not associated with mortality.

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Aim: The aim of this study was to investigate the ABO and Rh blood group distribution and clinical characteristics in patients with Covid-19. Materials and Methods: The clinical characteristics and blood groups of 1667 patients who were hospitalized due to Covid-19 (with a positive PCR test) between 16 March and 10 July were reviewed cross-sectionally.. Results: When blood groups of patients diagnosed with Covid-19 and control group were compared, it was observed that there was increase in the number of Covid-19 patients with blood groups A and AB, decrease in the number of Covid-19 patients with blood group O, a statistically significant increase in the number of individuals with blood group A in Covid-19 patients compared to healthy individuals, and almost significant increase in the number of Covid-19 patients with blood group AB and a very significant decrease in the number of Covid-19 patients with blood group O. Conclusion: Our study has found that having blood group O may be protective, that blood group A may have greater susceptibility to the disease, but this does not affect the course of the disease and is not associated with mortality.

Background: In studies, ABO blood group system has been shown to be associated with type 2 diabetes mellitus, chronic renal failure, gestational diabetes mellitus, postpartum depression, coronary artery disease, Crohn’s disease as well as various cancer types such as stomach, breast, skin cancers and rheumatologic diseases. Aims and Objective: The relationship between anti TPO positivity and ABO blood group system is aimed to be investigated by using blood groups which are the product of genetic structure and easy to identify by considering the relationship between anti TPO positivity and blood group. Materials and Methods: 4312 patients with determined blood groups were included among the patients, who were admitted to the internal medicine outpatient clinics of our hospital between January 2, 2017 and May 28, 2019 and were screeened for thyroid antibodies with thyroiditis susceptibility. Results: The most common blood group was A in both anti TPO positive and anti TPO negative patient groups.The rate of those with O blood group was 2.65% higher in anti TPO positive group than anti TPO negative group. B blood group was found to be 4.87% higher in anti TPO negative group than anti TPO positive group (p:0.148). Conclusion: In conclusion, it was found that O blood group may be a risk factor for anti TPO positivity and B blood group is much lower in anti TPO positive ones. However, it is obvious that more comprehensive prospective multicentered clinical and experimental studies are needed to establish the relationship between blood groups and autoimmune diseases, especially autoimmune thyroiditis.