A disease causing agent that does not usually infect and cause disease in a person with a healthy immune system is termed a(an):

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An opportunistic pathogen is a disease-causing agent that does not typically cause disease in a healthy individual but may cause disease in immunocompromised individuals, such as those with weakened immune systems from illness or medication. This type of pathogen takes advantage of the weakened immune system to cause infection and disease.

A Disease Causing Agent That Does Not Usually Infect and Cause