Before revision:  In this present study , we consider a new mathematical model on COVID-19 transmission that incorporate lock-down effectand variability in transmission between symptomatic and asymptomatic populations with former being a fast spreader of the disease. Using daily COVID-19 notified cases from three states (Maharashtra, Delhi, and Telangana) and overall India, we assess the effect of current 21 days lock-down in terms of reduction cases and deaths.
After revision:  In this present study , we consider a new mathematical model on COVID-19 that incorporates lockdown effect. By validating our model to the data on notified cases from three states (Maharashtra, Delhi, and Telangana) and overall India, we assess the effect of current 21 days lock-down in terms of reduction cases and deaths.