Abstract

Human population is going to increase up to 7 billion and parallel to this huge increase of population a variety of serious public health problems are also prevailing in the world. During the last few years, several viral epidemics of corona virus {such as SARS (Severe Acute Respiratory Syndrome) corona virus prevailed in 2002 to 2003 and H1N1 influenza in 2009} have caused large number of human deaths worldwide. Corona viruses are group of viruses having single-stranded positive sense RNA viruses of 27 to 34 kilo bases and helical evenness nucleocapsid. Such viruses belong to the Corona vridae family and show up simply like spiked rings when seen through an electron magnifying lens. Corona viruses isolated in various species of animals and can cross species barriers.