Delta shows “escape” from vaccine-induced immunity

Even though AstraZeneca’s COVISHIELD induced high neutralising antibody responses even after a single dose, a single dose gives less protection against variants such as Delta. Therefore, it is vital to get the second dose with the emergence of Delta, as only both doses would protect a person against such variants, Prof. Neelika Malavige said.

She stressed that Delta has been shown to escape vaccine-induced immunity. Therefore, many people who have received both doses of any vaccine can get infected, although infection rates are “very much less” than in those who are unvaccinated.