Corona virus COVID-19 is caused by SARS (Severe acute respiratory syndrome corona virus 2)-CoV-2, is an infectious disease. It mainly effects the respiratory system, and extends beyond the respiratory system. It causes acute respiratory illness. Most of the people who are infected experienced mild to moderate illness some people are severely infected and required medical treatment. In India total covid conformed cases till 12April 2022 was 497,960,492, conformed deaths are 6,181,850 and vaccines administered are 11,250,782,214. In china 81% of population had mild symptoms, 14% had severe disease, 5% were affected with critical illness, mortality rate was 2.3 %.