Two worst pandemics- Spanish Flu and COVID-19: A review

1918 Spanish flu and COVID-19 can be considered as most hazardous pandemics earth has ever witnessed. They are results of what mayhems an organism not even visible with naked eye can cause. Causative agent for both the diseases is a virus but, they are not same. 1918 Spanish flu gave major indications that it has the existence of the new strain of flu and lasted for longer duration affecting lives in various ways. COVID-19 is again an indication of another emerging worst pandemic. Here, we have reviewed the overall factors that contributed to the severity of these two pandemics and comparison of the same. The main motive of this paper is to put together, compare and analyze versatility of both the pandemics and to discuss implications of the same.