The Corona Chronicle - From History To Hitherto - A Perspective

COVID-19 has a global outbreak since its discovery in Hubei province, China in December 2019. Following this it had been declared as a “Public Health Emergency of International Concern” on 30th January 2020 by the World health Organization (WHO). Corona viridae, the causative species that is not new to the society, yet poses serious threat to life in under developed to well-developed nations. First occurrence of such enveloped, non-segmented, single-stranded RNA viruses with club shaped projections was cited back in 1930's attributing to cause respiratory infection in domesticated chickens. The human corona viral illness was eminently noted around 1960's wherein healthy human volunteers were relied on to detect the virus involved in the causation of common cold, an infection of the upper respiratory tract. Tracing back the etiology of such sickness, emergence from the bats and transmission and adaptation in other mammals have occurred which had further led to extensive layout of the malady. It was after the year 2003 when the human population was heavily affected, these infections were thrown to limelight indicating the fierce nature of this mutated subspecies. Since then so many disease variants have been identified including Severe Acute Respiratory Syndrome (SARS-CoV), the Middle Eastern Respiratory syndrome (MERSCoV), Bat corona virus (RaTG13) and the COVID 19 (The novel coronavirus- initially named to be SARS-CoV-2). Not just the upper respiratory tract anymore, this disease had turned out to be more aggressive affecting the entire system causing a complete shutdown.