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. 2018 Mar 15;9:480. doi: 10.3389/fmicb.2018.00480

FIGURE 1.

FIGURE 1

Illustration of the two phases (“faces”) of S. suis as a pathobiont in the respiratory tract. These are, firstly, as a colonization commensal bacterium and, secondly, as an invasive pathogen breaching different defense barriers. Some bacterial, host, and environmental factors, which contribute to the switch between both phases are depicted.