Dhar , Tirthankar, Saurabh Kole, Arijit Dey, Debdutta Haldar, Shawansikta Sinha, and Nasreen Chowdhury. 2022. “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 10 (1):31-36. https://doi.org/10.53553/JCH.v10i01.005.