S. gordonii is seen as a _________ that is capable of mitigating the activity of a more pathogenic organism through modulation of host epithelial cell signaling.

S. gordonii is seen as a _________ that is capable of mitigating the activity of a more pathogenic organism through modulation of host epithelial cell signaling.

• A. Homeostatic commensal
• B. Pathogen
• C. Opportunistic pathogen
• D. Mutualistic symbiont

Answer: (A)

The idea being tested is how certain oral bacteria help keep the environment in balance by talking to host cells to keep pathogens in check. Streptococcus gordonii is a typical oral commensal that contributes to tissue and microbial community homeostasis. By interacting with epithelial cells, it can modulate signaling pathways in a way that reduces the activity or virulence of a more pathogenic organism, thereby mitigating disease risk. This fits the role of a homeostatic commensal: it lives in the host, supports stable conditions, and helps prevent disease through host signaling modulation, without causing disease itself. It’s not a pathogen, and it doesn’t fit the idea of an opportunistic pathogen since it doesn’t typically cause disease under normal conditions. While some commensals can be mutualistic, the emphasis here is on maintaining host-microbe balance and suppressing pathogenic activity rather than a direct mutual benefit to both partners.

The idea being tested is how certain oral bacteria help keep the environment in balance by talking to host cells to keep pathogens in check. Streptococcus gordonii is a typical oral commensal that contributes to tissue and microbial community homeostasis. By interacting with epithelial cells, it can modulate signaling pathways in a way that reduces the activity or virulence of a more pathogenic organism, thereby mitigating disease risk. This fits the role of a homeostatic commensal: it lives in the host, supports stable conditions, and helps prevent disease through host signaling modulation, without causing disease itself.

It’s not a pathogen, and it doesn’t fit the idea of an opportunistic pathogen since it doesn’t typically cause disease under normal conditions. While some commensals can be mutualistic, the emphasis here is on maintaining host-microbe balance and suppressing pathogenic activity rather than a direct mutual benefit to both partners.