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Mean ratios of plasmids (pXO1 and pXO2) to chromosomes and percentage of survival of AVA-vaccinated guinea pigs by MLVA clusters. There is a wide range of variability for all of the means across MLVA clusters, and it is difficult to detect any apparent associations between mean plasmid ratios and percentage of survival. The dendrogram below the graph is adapted from previous published genetic typing results (15) and indicates the genetic relationships among the MLVA clusters shown.
