OVERVIEW OF CORONAVIRUSES

Abstract

Coronaviruses (CoVs), enveloped to be a strand RNA virus, which are described by the name due to its crown-like spike
protein substances with bulbous surface projection. CoVs cause an assortment of illnesses in birds, animals like bats, pigs,
snake, chickens, and extend to human. It is a type of respiratory tract diseases. The family Coronaviridae envelops an
expansive range of animal and human infections, all portrayed by a particular morphology. Coronaviruses are probably
circular in shape with outer membranes. Every molecule is encompassed by a halo or "crown" which refers to the
bulbous distal parts of the membrane embedded glycoproteins. Before 2003 individuals from this family were accepted
to cause just gentle respiratory sickness in people. But after 2003 the virus got derived themselves in different
characteristic forms creating extreme intense respiratory infection (SARS-CoV). The later raise of MERS-CoV and now
recent nCoV creating COVID-19 disease are creating more challenges to humans. This paper gives the overall knowledge
about various coronaviruses from historical background to till date.