RT Journal Article SR Electronic(1) A1 Salmaso, S YR 1999 T1 Pertussis eradication: a challenge for public health JF Eurosurveillance VO 4 IS 12 SP 127SP 50 OP 127 DO https://doi.org/10.2807/esm.04.12.00050-en UL https://www.eurosurveillance.org/content/10.2807/esm.04.12.00050-en