A little wonder, every day
A bacterium’s effect depends on strain and location
AI-generated conceptual gut microbiome ecosystem; it does not classify microbes as beneficial or harmful and makes no numerical claim. Generated 2026-10-29. Prompt: “Vertical 4:5 clean science illustration of a diverse gut microbiome ecosystem, with friendly stylized bacterial shapes living along an intestinal lining. Show variety and context, no good-versus-evil symbols, no labels, text, percentages, numbers, or disease depiction. Editorial textbook style.”
Listen to fact0:00 / —
There is no reliable universal rule that 99% of bacteria are beneficial and 1% are dangerous. For example, some strains of Escherichia coli normally live in the gut, while other strains can cause foodborne illness. A bacterium’s effect depends on its strain and where it is found.
