RT Journal Article SR Electronic(1) A1 Zeddeman, A A1 van Gent, M A1 Heuvelman, C J A1 van der Heide, H G A1 Bart, M J A1 Advani, A A1 Hallander , H O A1 Wirsing von König, C H A1 Riffelman, Marion A1 Storsaeter, J A1 Vestrheim, D F A1 Dalby, T A1 Krogfelt, K A A1 Fry, N K A1 Barkoff, A M A1 Mertsola, J A1 He, Q A1 Mooi, F YR 2014 T1 Investigations into the emergence of pertactin-deficient Bordetella pertussis isolates in six European countries, 1996 to 2012 JF Eurosurveillance VO 19 IS 33 SP 20881 OP DO https://doi.org/10.2807/1560-7917.ES2014.19.33.20881 UL https://www.eurosurveillance.org/content/10.2807/1560-7917.ES2014.19.33.20881