Understanding Coronaviruses: Sars, Mers, and the Covid-19 PandemicWhile many scientists believed influenza would cause the next great pandemic, no one was prepared for the new strain of coronavirus that appeared in 2019. SARS CoV 2, the virus that causes COVID 19, has infiltrated every country and put global public health and the economy at risk. Health care systems have been pushed to the limit as protective gear, life saving equipment, tests, and vaccines are scarce and in high demand. From the initial infection