Dhar , T. ., S. . Kole, A. . Dey, D. . Haldar, S. . Sinha, and N. Chowdhury. “Assessment of Antibody Levels Amongst Health Care Workers Vaccinated With Two Doses of COVID Vaccine 6 Months ago in a Hospital of Kolkata, West Bengal: Is There Any Need for a Third Dose (Booster Dose) of COVID Vaccine?”. Journal of Comprehensive Health, vol. 10, no. 1, June 2022, pp. 31-36, doi:10.53553/JCH.v10i01.005.