Average bacterial community compositions in the Pars oesophagea of H. suis-positive and -negative pigs. The cumulated histograms show the relative abundance of the identified taxa at phylum (A), family (B) and genus (C) level in the Pars oesophagea of H. suis-positive (n = 10) and -negative (n = 10) pigs. At family and genus level, taxa with a relative abundance < 1% are merged in the category “others”. The unclassified populations correspond to defined groups of the genus level for which a taxonomical classification assignation to the genus could not be attributed. These populations are therefore labelled with the first defined superior hierarchical taxonomic level followed by “_unclassified” to prevent confusion.