Our Overall Current Knowledge of Covid 19: An Overview

Abstract

The World Health Organization (WHO) declared COVID-19 as a public health epidemic emergency of international concern in March 2020. In just two years, this pandemic has invaded most countries and killed more than 4,800,000. The evolution of the number of cases and contaminations per day remains alarming. In May 2021, the bar of 400,000 new cases was crossed in India; this represents the highest daily number of cases recorded by a country in the history of the COVID-19 pandemic. In addition, new variants of the virus emerged in some countries. The international scientific and political community has organized itself and engaged in a race against time to find possible remedies. During this period, when people were forced to confine themselves to their homes, the way of life changed remarkably. From the declaration of the pandemic to the conception of the first vaccine, people are still in shock. This article is a short-review that explains in general what the COVID-19; the origin, biology and genetics as well as the mode of transmission and contamination of the coronavirus are discussed.