Opportunistic infection

An opportunistic infection is an infection caused by pathogens (bacterial, viral, fungal or protozoan) that usually do not cause disease in a healthy host, i.e. one with a healthy immune system. A compromised immune system, however, presents an "opportunity" for the pathogen to infect. Immunodeficiency or immunosuppression can be caused by: These infections include: Treatment depends on the type of opportunistic infection, but usually involves di... more
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