A negative trend was found for the serological levels among participants who had never been infected, with the adjusted median antibody measurements scaling from 8.7 at one month, to 7.3 at three months, and down to 4.6 at six months after vaccination ( 16 ).
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Determinants of anti-S immune response at 6 months after COVID-19 vaccination in a multicentric European cohort of healthcare workers - ORCHESTRA project.
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