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Longitudinal course and individual ID50 values of neutralizing antibody titers at 20 (T20) and 200 (T200) days following the second dose of the BNT162b2 vaccination in previously infected healthcare workers. The colored symbols indicate the individual ID50 values for the Delta variant and wild-type variant for each subject. Asterisks indicate significance levels: *** p < 0.001. ID50: reciprocal value of the serum dilution that showed a 50% protection of virus cytopathic effect.
