Abstract
The novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes the COVID-19 disease, which is a considerable outbreak that appeared in late 2019, and within a short period, this disease rapidly extended globally. Its prompt airborne transmission and highly infectious pneumonia-like symptoms in patients caused turmoil worldwide. This virus has a relatively high mortality rate compared to previous outbreaks such as Middle East respiratory syndrome coronavirus and SARS-CoV. Therefore, the World Health Organization declared COVID-19 a global health pandemic on January 30, 2020. However, the recent COVID-19 outbreak and newly emerged variants such as Delta and Omicron are having a huge spike in the human population. This rise has been a kind of challenging situation worldwide as perception is still limited in terms of modes of transmission, severity, diagnostics clinical oversight. Therefore, this review highlights the importance of these issues via a Medline search using the terms novel, coronavirus, sources, genetic nature, contagious routes, clinical characteristics, and diagnostic procedures for COVID-19. The authors extensively reviewed the analysis of behavior and impacts of this virus's activities worldwide. The study reveals that patients' epidemiology and clinical characteristics in different frames are sensitive toward commanding this virus and its associated diseases. Finally, the parametric data gathered for this study are also presented for use in forecasting models. Along with these searches, the authors have comprehensively discussed the current modern diagnostic processes.
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