A term used to describe a disease-causing organism that has been weakened and used in a vaccine to protect against that disease is:

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Attenuated refers to a disease-causing organism (such as a virus or bacterium) that has been weakened so that it is no longer virulent or dangerous, but can still trigger an immune response. This weakened organism is used in some types of vaccines to stimulate the body's immune system to produce antibodies against the disease, without causing the actual disease itself.

A Term Used to Describe a Disease-Causing Organism That Has