27 year old patient with hepatitis B (which shares many risk factors with HIV infection) presents with chronic weight loss and acute shortness of breath with cervical lymphadenopathy, white plaques in the mouth (most consistent with thrush), relatively low lymphocyte count and bilateral diffuse infiltrates on CXR most consistent with Pneumocystis pneumonia in setting of HIV/AIDs
Key idea: Patient with HIV is considered to have progressed to AIDS when their CD4 count drops below 200 or if they develop an AIDS-defining infection (such as PCP pneumonia)
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