Fig. 4From: Investigating the pertussis resurgence in England and Wales, and options for future controlBox plots of parameter estimates from the 2000 best fitting aP scenarios to historical notification data between 1956 and 2013 in England and Wales. a Duration of natural immunity; b α2/α1; c duration of wP vaccine protection; d degree of whole cell vaccine protection against infection; e duration of aP vaccine protection; f degree of acellular vaccine protection against infection. Red line for median, blue box for lower and upper quartiles and black bars for minimum and maximumBack to article page