After the emergence of the novel 2019 coronavirus disease in P. R. China, this highly contagious disease has been currently spread out to almost all countries, worldwide. Novel 2019 coronavirus disease, Middle East respiratory syndrome, and severe acute respiratory syndrome are reported to cause a higher risk for severe infections in patients with chronic comorbidities, such as hypertension and diabetes. These severe infections can contribute to higher rates of morbidity and mortality in these patients. In the present review, we discussed the role and underlying mechanisms of the two most common chronic diseases, type-2 diabetes mellitus and hypertension, in clinical manifestations and disease severity of novel 2019 coronavirus disease, Middle East respiratory syndrome and severe acute respiratory syndrome, with the hope to provide evidence for better decision-making in the treatment of this vulnerable population.

The complement system, as a vital part of innate immunity, has an important role in the clearance of pathogens; however, unregulated activation of this system probably has a key role in the pathogenesis of acute lung injury, which is induced by highly pathogenic viruses (i.e. influenza A viruses and severe acute respiratory syndrome [SARS] coronavirus). The novel coronavirus SARS-CoV-2, which is the causal agent for the ongoing global pandemic of the coronavirus disease 2019 (Covid-19), has recently been spread to almost all countries around the world.Although most people are immunocompetent to SARS-CoV-2, a small group develops hyper-inflammation that leads to complications like acute respiratory distress syndrome, disseminated intravascular coagulation, and multi-organ failure.Emerging evidence demonstrates that the complement system exerts a crucial role in this inflammatory reaction. Additionally, patients with the severe form of Covid-19 show over-activation of the complement in their skin, sera, and lungs. This study aims to summarise current knowledge concerning the interaction of SARS-CoV-2 with the complement system and to critically appraise complement inhibition as a potential new approach for Covid-19 treatment.

Around the end of December 2019, a new beta-coronavirus from Wuhan City, Hubei Province, China began to spread rapidly. The new virus, called SARS-CoV-2, which could be transmitted through respiratory droplets, had a range of mild to severe symptoms, from simple cold in some cases to death in others. The disease caused by SARS-CoV-2 was named COVID-19 by WHO and has so far killed more people than SARS and MERS. Following the widespread global outbreak of COVID-19, with more than 132758 confirmed cases and 4955 deaths worldwide, the World Health Organization declared COVID-19 a pandemic disease in January 2020. Earlier studies on viral pneumonia epidemics has shown that pregnant women are at greater risk than others. During pregnancy, the pregnant woman is more prone to infectious diseases. Research on both SARS-CoV and MERS-CoV, which are pathologically similar to SARS-CoV-2, has shown that being infected with these viruses during pregnancy increases the risk of maternal death, stillbirth, intrauterine growth retardation and, preterm delivery. With the exponential increase in cases of COVID-19 throughout the world, there is a need to understand the effects of SARS-CoV-2 on the health of pregnant women, through extrapolation of earlier studies that have been conducted on pregnant women infected with SARS-CoV, and MERS-CoV. There is an urgent need to understand the chance of vertical transmission of SARS-CoV-2 from mother to fetus and the possibility of the virus crossing the placental barrier. Additionally, since some viral diseases and antiviral drugs may have a negative impact on the mother and fetus, in which case, pregnant women need special attention for the prevention, diagnosis, and treatment of COVID-19.

: Since the outbreak of coronavirus disease 2019 (COVID-19), in Wuhan, China, there were more than 1,773,000 confirmed infected cases. This infection has spread to almost all countries around the world with reported high mortality and morbidity. Infections in children and infants have been reported as well. The condition of the infected children was mostly mild. To date, there have been two reported deaths in pediatrics testing positive for COVID-19 in China, and no deaths have been reported in the published evidence from other countries. The therapy strategy for the children who suffer coronavirus disease (COVID-19) has been based on the adult experience. The present review summarizes current knowledge of the etiology, epidemiology, clinical manifestations, transmission, diagnosis, treatment, and prevention of COVID-19 infection in children and infants.

For the last three decades, the world population has experienced new epidemics of coronaviruses. The world is currently witnessing the novel coronavirus disease (COVID-19) epidemic, which is a disease that comes from a novel coronavirus called Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The available genetic and clinical proofs suggest a similar route to those of Middle East respiratory syndrome (MERS) and SARS. The clinical manifestations of infections caused by coronaviruses including SARS, MERS, and COVID-19 are pneumonia, bronchitis, or other serious respiratory infections. Various transmission ways (e.g., nosocomial transmission) and transmission through moderately symptomatic or non-symptomatic infected individuals have caused great concerns. Although no certain treatment has so far been developed for this disease, and prevention is the main applied strategy for these viruses, some medications can be used to help with this disease. Corticosteroids can be mentioned as an example of these medications. This article specifically reviewed the evidence regarding the effectiveness of the corticosteroid therapy for the coronavirus family (i.e., SARS, MERS, and COVID-19) and showed that there are insufficient data to recommend corticosteroid therapy for patients suffering from COVID-19.