A relationship has been identified between the blood group and infectious diseases. COVID-19 is an infection caused by a new coronavirus designated as SARS-CoV-2, which has rapidly spread worldwide. In this retrospective study, COVID-19 patients who were referred to Razi Hospital in Ahvaz from February 2020 to May 2020 were evaluated and analyzed using SPSS v.16.0. The relationship between the ABO blood group and COVID-19 was assessed using the Kruskal Wallis test and Spearman correlation coefficient. The frequencies of blood types O, AB, B, and A were 40.2, 11.8, 25.5, and 22.5%, respectively, Among the 8016 COVID-19 patients, the frequencies of blood types O, AB, B, and A were 41.9, 9.3, 25.7, and 23.1%, respectively, and no significant difference was observed in terms of the distribution of blood groups between the healthy and infected people (P = 0.34, 95% CI = 0.66-1.23). In addition, patients admitted to the ICU ward had blood groups of O, AB, B, and A, with a percentage of 21.3, 31.29, 33.6, and 35.3%, respectively. Furthermore, dead patients had A, B, AB, and O blood types with a percentage of 10.0, 11.4, 11.05, and 16.3%, respectively. A significant relationship was observed between the blood group and disease severity and death in COVID-19 patients (p=0.05, 95% CI = 1.02-1.73). The study showed that people with blood types A and O are at higher and lower risk of infection, severity, and death from COVID-19, respectively.

This cross-sectional retrospective descriptive study was performed to determine the role of the emergency medicine in the management of thunderstorms associated asthma Multiple Casualty Incident (MCI) and to give an overview of affected patient characteristics. Eligible participants were all patients presented to the ED with acute bronchospasm, between 2nd-7th November, 2013. Not only available medical records of all patients were gathered and analyzed, retrospectively but also the effectiveness of the MCI plan designed by emergency medicine was reviewed. There was no gender priority in the studied population (201 male, 242 female). The majority of affected patients were aged between 20-40 (278 out of 443). Only 40 patients of all 443 were admitted (37 in the pulmonary ward and 3 in the ICU). No mortality in the ED was reported. Over 50% of patients had a positive history of asthma, allergies have been treated at least once for shortness of breath or asthma previously. Our findings illustrate that described respiratory illness MCI seems to have a benign course, since the majority of patients discharged home. Besides, the designed protocol for treatment of patients and managing the MCI were obviously effective.