Nearly 30% individuals lose their vaccine-acquired immunity after six months, a study conducted to understand the longevity of vaccine immunity in Indian population with respect to antibody levels has found. The study was conducted by AIG Hospitals along with the Asian Healthcare Foundation on 1,636 healthcare workers fully vaccinated with three of the Covid-19 vaccines currently being administered in the country.

from Times of India https://timesofindia.indiatimes.com/india/30-people-losing-vaccine-acquired-immunity-after-six-months-aig-study/articleshow/88994064.cms