COVID-19: What Do We Have Learnt So Far?
Keywords:SARS-CoV, MERS-CoV, WHO
Coronaviruses (CoVs) are the largest group of viruses; order is Nidovirales while family is Coronaviridae. They are further subdivided into four groups, the alpha, beta, gamma and delta coronaviruses . These viruses usually cause mild infections but two zoonotic epidemics of the betacoronaviruses, severe acute respiratory syndrome coronavirus (SARS-CoV)  and Middle East respiratory syndrome coronavirus (MERS-CoV)  have occurred in this century, mortality rates of 10% for SARS-CoV  while a very high i.e. 37% for MERS-CoV .