Interaction Between Staphylococcus aureus and Microbiota: Invasion or Commensalism

The term "Microbiota" refers to the vast array of symbiotic microorganisms that coexist with their hosts in practically all organs. However, the microbiota must obtain nutrition and minerals from its host to survive; instead, they produce beneficial compounds to protect the host and regulate the immune system. Conversely, pathogenic bacteria utilize their enzymes to independently gain sustenance through an invasive process without almost any beneficial compound production. One of the fully equipped pathogens, Staphylococcus aureus, is present in nearly every organ and possesses a variety of defense and invasion systems including an enzyme, a mineral collection system, a system for detecting environmental conditions, and broad toxins. The microbiota properly can defend its kingdom against S. aureus; however, if necessary, the host immune system is alerted against the pathogen, so this system also acts against the pathogen, a game that can ultimately lead to the death of the pathogen. However, S. aureus can change the host's conditions in its favor by changing the host's conditions and causing inflammation, a condition that cannot be tolerated by the microbiota. In this review, we will explain how microbiota defend against S. aureus.