Opportunistic infection

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Opportunistic infection
Classification and external resources
MeSH D009894

An opportunistic infection is an infection caused by pathogens, particularly opportunistic pathogens—those that take advantage of certain situations—such as bacterial, viral, fungal or protozoan infections that usually do not cause disease in a healthy host, 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:

Types of infections[edit]

Further information: Immunodeficiency


Treatment depends on the type of opportunistic infection, but usually involves different antibiotics.

Veterinary treatment[edit]

Opportunistic infections caused by Feline Leukemia Virus and Feline immunodeficiency virus retroviral infections can be treated with Lymphocyte T-Cell Immune Modulator.