Scientists and pharmaceutical companies have successfully generated vaccines to fight the coronavirus disease (COVID-19) pandemic. Most of these vaccines are very effective in combating the disease.
However, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is an RNA virus that has a propensity to mutate often. This may result in the vaccines against COVID-19 becoming ineffective over time as new strains evolve. Moreover, the immunity against the virus was found to decrease over time, in people who have had prior COVID-19 infection and in the vaccinated population.