Given that the virus is currently in the global pandemic stage and causes severe symptoms in some patients even without underlying disease. Therefore, it seems necessary to study internal characteristics, such as blood group, temperament, or even genes of patients. This cross-sectional study was conducted in 2020 in Vasei Hospital (Sabzevar City, Razavi Khorasan Province, Iran). For this purpose, 100 patients were selected among those who had respiratory symptoms and their coronavirus disease 2019 (COVID-19) test was positive.
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