Infections caused by a normally nonpathogenic organism often affecting individuals who have a decreased immune system or are elderly are opportunistic infections.
a disease-causing organism other than one that ordinarily causes infection. People with compromised immune systems are more susceptible to opportunistic infections.
Several of the most typical OIs among Americans with HIV include: Infection with the herpes simplex virus type 1 (HSV-1), a virus that can lead to mouth and lip sores. Salmonella infection is an intestinal bacterial infection.
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