Abstract

<p>Fecal pellets were sampled from eight mice before (t = 0) they were infected intranasally with 150 CFU of <i>B</i>. <i>pseudomallei</i> and 72 hours after (t = 72). Microbial composition was analysed by IS-pro, using the number of nucleotides between the genes for ribosomal subunit 16 and 23 in the DNA (interspacer region) of the bacterium as a unique classification characteristic. (A) Clustering analysis, by unweighted pair group method with arithmetic mean (UPGMA) on cosine distances, shows the similarity of samples; individual mice are indicated by a number. Colors represent the most important bacterial phyla (purple, Actinobacteria; red, Bacteroidetes; blue, Firmicutes, Actinobacteria, Fusobacteria, and Verrucomicrobia (FAFV); yellow, Proteobacteria). Length of the interspacer regions in basepairs is indicated on the y-axis; lines indicate the presence of PCR products. Color intensity increases with the presence of PCR product. (B) Diversity of microbial communities before and 72 hours after induction of melioidosis, expressed as Shannon index (green: total bacteria; red: Bacteroidetes; Blue: Firmicutes, Actinobacteria, Fusobacteria, and Verrucomicrobia (FAFV); yellow: Proteobacteria). Data are presented as box- and whisker plots showing the smallest observation, lower quartile, median, upper quartile and largest observation. ** p<0.01 pre- versus post-infection.</p

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