A pandemic is an epidemic that reaches worldwide. The world health organization has specific criteria for when an epidemic becomes pandemic. A world woke up of the novel Corona Virus outbreak in March 2020. The WHO (World Health Organization) declared a pandemic on March 11, 2020. The coronavirus diseases first started from Wuhan, in China's Huawei Province. Late last year and spread across the globe, a team of doctors in China has claimed that the lungs of 90 percent of Covid -19 patients who recovered in Wuhan, the city where the outbreak of diseases was first reported are still damaged lungs. The study finds asymptomatic Covid -19 patients spread virus similar to symptom ones.