ABSTRACT
The drive for vaccinations is playing crucial role to manage the ongoing pandemic. These vaccinations have various strategies. Especially in India, two doses of each vaccine are given. Every dose holds the reinforcement into the human body. These doses subsequently cannot hold the immunity. In this term, the booster dose of vaccination is desired. In this paper, the effectiveness of these two doses and one booster dose is calculated on advancement of COVID-19 through a system of non-linear differential equations. This system has divided population into two parts, that is exposed individuals and unexposed individual. The improvement of the doses on these individuals is calculated through the threshold. The stability of the model along with the simulation is considered to brace the ongoing situation.
