The whole world is currently on the quest to prevent and survive Kovid 19 caused by the coronavirus. There are situations in the past where coronavirus has become a threat to the world. The coronavirus was the root cause of SARS, which originated in China, and MERS in Central Asia. According to current estimates of these diseases with Kovid 19, the mortality rates of SARS and MERS were high but the prevalence was low compared to Kovid. Do people who have contracted coronavirus in the past catch the new coronavirus?