infection including tuberculosis (TB) and non-tuberculous mycobacterium
Bacterial pneumonia (S. pneumonia, H. influenzae, S. aureus)
Fungal infection (Blastomycosis, Coccidiomycosis)
Malignancy, most likely lymphoma
HIV with a secondary process such as bacterial infection, pneumocystic carinii pneumonia (PCP), TB, mycobacterium avium complex (MAI), lymphoid interstitial pneumonitis (LIP)
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