RT Journal Article SR Electronic(1) A1 Zakrzewska, A A1 Galazka, A A1 Rymkiewicz, D YR 1997 T1 Changes in age specific immunity to diphtheria in Poland in the past 40 years JF Eurosurveillance VO 2 IS 8 SP 64SP 129 OP 67 DO https://doi.org/10.2807/esm.02.08.00129-en UL https://www.eurosurveillance.org/content/10.2807/esm.02.08.00129-en