In the late of 2019, unfamiliar cases of pneumonia were announced in Wuhan City, Hubei Province, China that resulted in high mortality rates of 2%. Shortly, these cases were reported to be brought about by a novel type of coronaviruses named as novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The disease caused by this novel virus is designated as coronavirus disease-2019 (COVID-19). Instantly afterwards, this disease exhibited an extreme spreading rate and the infection has geographically shifted to affect the whole world including the Middle East countries involving Egypt. Thus, it is not surprising that a lot of reports and literature have been directed to provide information and describe the clinical features of this pandemic. In this report, we describe in details the characteristic features of COVID-19 pandemic with attention to the management and control in Egypt. Characters of the virus, mode of transmission, pathogenesis, clinical symptoms, diagnosis, treatment, and prevention are fully described.

Background: Life threatening infections caused by the opportunistic pathogen K. pneumoniae are one of the most serious infections that elevate mortality rate in hospitals, worldwide. K. pneumoniae develops several mechanisms for avoiding killing by the complement system for survival in the host. The complement system is the first line of immune defense against different bacteria including K. pneumoniae. Objective: In this study we assessed the role of complement system in killing of both serum resistant and serum sensitive strains of K. pneumoniae. Methodology: Six clinical isolates of K. pneumoniae were collected from urine, sputum and the blood samples from patients in Mansoura Hospitals University. Serum bactericidal effect was assessed and confirmed by Turbidimetric method, Complement mediated lysis, complements C3b deposition and fH binding were assessed by ELISA. Results: our results demonstrated that complement mediated killing of K. pneumoniae is driven via the Alternative pathways, it was found that a lower C3b deposition via AP and a higher fH binding to surface of serum resistant K. pneumoniae strains compared with serum sensitive K. pneumoniae Conclusions: This study explains the role of complement system in killing K. pneumoniae and how serum resistant strains escape the immune defense via sequestering complement factor H.