The affect of “good” microbes against invading microbes is called_____
Microbial antagonism
Endogenous infection
Infectious disease
Virulence
Pathogenicity
The correct answer and explanation is :
The correct answer is Microbial antagonism.
Explanation:
Microbial antagonism refers to the phenomenon where the normal microbiota (the “good” microbes) in a particular environment, such as the human body, protect the host from potential infections by inhibiting the growth or activity of harmful or pathogenic microbes (the “bad” microbes). This natural defense mechanism is a key part of the body’s immune system and involves several mechanisms.
- Competition for Resources: Normal microbiota compete with pathogens for space, nutrients, and other resources necessary for survival. When these beneficial microbes occupy space and consume available nutrients, they limit the resources that could otherwise be used by invading harmful microorganisms.
- Production of Antimicrobial Substances: Some beneficial microbes produce antimicrobial substances like bacteriocins, hydrogen peroxide, and lactic acid, which can inhibit or kill harmful pathogens. These substances make the environment less conducive for pathogen survival and growth.
- Stimulation of the Immune System: Beneficial microbes help to prime and stimulate the immune system, preparing it to respond more effectively to pathogens. This is an indirect form of microbial antagonism, as it enhances the body’s ability to recognize and fight off infections.
- Alteration of pH: Many normal microbiota produce metabolic by-products, such as lactic acid, which can lower the pH of their environment. A more acidic environment is less hospitable to many harmful microbes, thus preventing their colonization.
Microbial antagonism is crucial for maintaining the balance of the microbiome and preventing diseases. Disruption of this balance, such as through the use of antibiotics or other factors, can lead to infections, as the “good” microbes are wiped out, leaving space for pathogens to flourish.
In contrast, terms like Endogenous infection, Infectious disease, Virulence, and Pathogenicity are related to the process of infection and disease, but they do not directly describe the protective effect of normal microbiota against harmful microbes.