Abstract
The diversity and distribution of secretion systems in Klebsiella pneumoniae are unclear. In this study, the six common secretion systems (T1SS-T6SS) were comprehensively investigated in the genomes of 952K. pneumoniae strains. T1SS, T2SS, type T subtype of T4SS, T5SS, and subtype T6SSi of T6SS were found. The findings indicated fewer types of secretion systems in K. pneumoniae than reported in Enterobacteriaceae, such as Escherichia coli. One conserved T2SS, one conserved T5SS, and two conserved T6SS were detected in more than 90% of the strains. In contrast, the strains displayed extensive diversity of T1SS and T4SS. Notably, T1SS and T4SS were enriched in the hypervirulent and classical multidrug resistance pathotypes of K. pneumoniae, respectively. The results expand the epidemiological knowledge of the virulence and transmissibility of pathogenic K. pneumoniae and contribute to identify the potential strains for safe applications.
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