Figure 2From: Comparative genomic profiling of Dutch clinical Bordetella pertussis isolates using DNA microarrays: Identification of genes absent from epidemic strainsTemporal trends in MLVA frequencies of Dutch B. pertussis strains from 1993 to 2004. Frequencies of different MLVA-types are shown. MLVA types found in frequencies lower than 1.6% in the whole period were combined into a single group designated R.Back to article page