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Due to the recent coronavirus disease 2019 (COVID‐19) pandemic and emergent administration of various vaccines worldwide, comprehensive studies on the different aspects of vaccines are in demand. This study evaluated antibody response after the second dose of the COVID‐19 vaccine in the Children's Medical Center personnel. The blood samples of 174 healthcare workers were gathered at least 10 days after vaccination. The administered vaccines included Oxford/AstraZeneca, COVAXIN, Sinopharm, and Sputnik V. This study assessed all antibodies employing ELISA methods, including anti‐SARS‐CoV‐2 neutralizing antibody by DiaZist and Pishtazteb kits, anti‐SARS‐CoV‐2‐nucleocapsid by Pishtazteb kit, and anti‐SARS‐CoV‐2‐Spike by Razi kit. The cutoff for the tests' results was calculated according to the instructions of each kit. Totally, 174 individuals with an average age of 40 ± 9 years …