PROS1 and Middle East respiratory syndrome: This may add to its pathogenicity.7 Envelope (E) proteins, Membrane (M) proteins and Spike (S) proteins have been identified in coronavirus.8 S-proteins have been found to have a role in the recognition and attachment of the virus to the Angiotensin Converting Enzyme 2 (ACE-2) receptors of the human epithelial cells in the respiratory mucosa.9 These features of COVID-19 bear resemblance with the infections caused by previously known Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS) coronaviruses.10