The world is currently witnessing a dramatic disruption of everyday life owing to the rapid progression of the coronavirus disease 2019 (COVID-19) pandemic. As the pandemic evolves, there is an urgent need to better understand its epidemiology, characterize its potential impact, and identify mitigatory strategies to avert pandemic-related mortality. Keywords - COVID-19, Pandemic Efficiency Index, PEI, Corona virus, Mortality, Pandemic, Epidemic, Global health, delta variant.