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Yes. Bacteria, viruses, and fungi all have the potential to become pathogens to different organisms. Although it doesn't mean that they are all necessarily infectious to human beings now, they have the potential due to genetic mutations and adaptations.

Bacteria are especially known to mutate quickly using horizontal gene transfers (cell to cell) and pick up different pathogenicity islands that enable them to become potent pathogens.

If you look at many of the bacterial/viral diseases the human population faces, many are from organisms common to different animal hosts that have mutated to become human pathogens.

Even the bacteria living on our skin as commensals have the ability to become pathogens once they enter our blood stream.

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