Old cultures of bacteria that have lost their ability to cause disease are said to be

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Old cultures of bacteria that have lost their ability to cause disease are referred to as attenuated. Attenuation can occur naturally over time or through deliberate methods such as culturing the bacteria under specific conditions or exposure to environmental stressors. Attenuated bacteria can still be useful in medicine for vaccine development or in bioremediation to break down pollutants.

Old Cultures of Bacteria That Have Lost Their Ability to Cause