Why are so few bacteria isolated from waterfowl resistant to antibiotics?

Resistance to an antibiotic is developed by a colony of bacteria that were exposed to the antibiotic. Using an inadequate dose of antibiotic with shorter duration can increase the resistance chance as not all bacteria are killed by the antibiotic.
In this case, the bacteria from waterfowl which was never got antibiotics. Since the bacteria are never exposed to the antibiotics so it should be sensitive to the antibiotics.

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