Coronaviruses are a large family of single-stranded RNA viruses that cause diseases in animals and humans. These viruses are named so because of spikes found on their surface that give them the appearance of a crown when looked through an electron microscope. CLASSIFICATION Broadly, coronaviruses (CoV) are the largest group of viruses that belong to the Nidovirales order, which includes Coronaviridae among three others. Coronavirinae can be further subdivided into alpha, beta, gamma and delta coronaviruses. The Coronavirus Study Group of the International Committee for Taxonomy of Viruses is responsible for classifying them and roughly seven years ago they classified them into the aforementioned divisions instead of the serological groups of three. Out of the seven, two are alpha coronaviruses (229E and NL63) and four are beta coronaviruses (OC43, HKU1, MERS and SARS-CoV). HISTORY OF CORONAVIRUS Till date seven different types of coronaviruses have been identified that infec...
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