What is the most common opportunistic infection in individuals with HIV?

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Multiple Choice

What is the most common opportunistic infection in individuals with HIV?

Pneumocystis jirovecii pneumonia is the most common opportunistic infection in people with HIV, especially when the CD4 count falls below about 200 cells/µL. This organism thrives in severely immune-suppressed lungs, making PJP the prototypical OI in advanced HIV/AIDS and one of the most frequent reasons for hospitalization in this population. Patients typically present with a subacute onset of dyspnea, non productive cough, and fever, with diffuse interstitial or ground-glass changes on chest imaging. Diagnosis is usually made by detecting Pneumocystis in respiratory specimens obtained via bronchoalveolar lavage or induced sputum, using special stains or PCR. Treatment is high-dose trimethoprim-sulfamethoxazole, with adjunctive corticosteroids if there is hypoxemia (for example, a low PaO2 or a significant A-a gradient). Prophylaxis with trimethoprim-sulfamethoxazole is recommended when the CD4 count is under 200 or if oropharyngeal candidiasis is present, to prevent PJP. While candidiasis, toxoplasmosis, and CMV-related diseases do occur in HIV, they are less common than PJP as overall opportunistic infections, and their occurrence is more tied to very advanced immunosuppression or specific sites of involvement.

Pneumocystis jirovecii pneumonia is the most common opportunistic infection in people with HIV, especially when the CD4 count falls below about 200 cells/µL. This organism thrives in severely immune-suppressed lungs, making PJP the prototypical OI in advanced HIV/AIDS and one of the most frequent reasons for hospitalization in this population.

Patients typically present with a subacute onset of dyspnea, non productive cough, and fever, with diffuse interstitial or ground-glass changes on chest imaging. Diagnosis is usually made by detecting Pneumocystis in respiratory specimens obtained via bronchoalveolar lavage or induced sputum, using special stains or PCR. Treatment is high-dose trimethoprim-sulfamethoxazole, with adjunctive corticosteroids if there is hypoxemia (for example, a low PaO2 or a significant A-a gradient).

Prophylaxis with trimethoprim-sulfamethoxazole is recommended when the CD4 count is under 200 or if oropharyngeal candidiasis is present, to prevent PJP. While candidiasis, toxoplasmosis, and CMV-related diseases do occur in HIV, they are less common than PJP as overall opportunistic infections, and their occurrence is more tied to very advanced immunosuppression or specific sites of involvement.

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