Vaccines are largely known to be safe and effective in protecting people against deadly and disabling infectious diseases. Currently, there are vaccines that are effective against over 20 diseases. Overall, it is estimated that vaccines save the lives of up to 3 million people annually.
However, over time, vaccination programs have faced several challenges prominent of which is the increasing vaccine hesitancy among the public. Hesitancy has particularly affected the newly introduced COVID-19 vaccines including the Oxford-AstraZeneca vaccine.