The protection offered by the Oxford-Astra Zeneca COVID-19 vaccine declines after three months of receiving two doses of the preventive revealed by a study published in The Lancet journal. The findings suggest that booster programs are needed to help maintain protection from severe disease, said a team of researchers led by the University of Edinburgh.
This may be significant for India as the biggest chunk of those vaccinated in the country has been given Covishield jabs. As of December 21, 2021, more than 89% of the vaccine doses administered in India were Covishield. Reduced effectiveness can be read as higher chances of need for hospitalization and even deaths. The study went on to conclude that those who took the Covishied vaccine may need to consider booster shots.
However, the experts warned that the figures should be treated with caution because it is becoming harder to compare unvaccinated people to vaccinated people with similar characteristics, particularly among older age groups where so many people are now vaccinated.