Which microorganism is NOT typically classified as a pathogen?

Beneficial probiotics are microorganisms that are not classified as pathogens because they provide health benefits to the host organism, particularly humans. Probiotics are often utilized to promote gut health, enhance the immune system, and prevent or treat certain gastrointestinal issues. Unlike pathogens, which are known to cause disease, these beneficial microorganisms contribute positively to health by maintaining a balanced microbiome.

On the other hand, bacteria, viruses, and fungi can include pathogenic species that are capable of causing infections and diseases. While some of these microorganisms can also have beneficial roles, they are more commonly associated with illness and health complications when they exhibit pathogenic behaviors or when they multiply excessively. This distinction is crucial in the study of microbiology and healthcare, as the understanding of which microorganisms are beneficial versus harmful impacts treatment options and overall healthcare strategies.