Opportunistic infections (OIs) are infections that occur more frequently and are more severe in individuals with weakened immune systems, including people with HIV. People are at greatest risk for OIs when their CD4 count falls below 200, but you can get some OIs when your CD4 count is below 500.
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<em>As Karen is preparing to present her research paper in her psychology class, she is filled will fear. She starts to sweat, and she notices that her mouth is very dry. Physiologically, Karen is experiencing the fight response that is activated by her sympathetic nervous system. </em>
