Answer :
Normal flora, also known as commensal or resident microbiota, generally have beneficial effects on the host. They contribute to nutrient metabolism, immune system development, and protection against pathogens.
However, certain deleterious effects can distinguish them from their beneficial role. Normal flora can become opportunistic pathogens and cause infections, especially when the host's immune system is compromised.
They may also produce harmful substances or toxins that can harm the host's tissues. Additionally, in certain circumstances, the presence of normal flora can trigger an inflammatory response that can lead to tissue damage.
These deleterious effects highlight the potential risks associated with normal flora in specific situations or when the delicate balance between host and microbiota is disrupted.
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