Figure 6From: Changes in the genomic content of circulating Bordetella pertussis strains isolated from the Netherlands, Sweden, Japan and Australia: adaptive evolution or drift?Histogram of the average gene content of strains carrying ptxP1 , ptxP2 , ptxP3 and ptxP6 types. Bars indicate the presence of the gene or geneclusters in all strains analyzed with a particular ptxP type, ptxP1 (n = 91), ptxP2 (n = 9), ptxP3(n = 39) and ptxP6 (n = 9).Back to article page