CD4⁺ count <500mm³:- Candida albicans – oral thrush- EBV – oral hairy leukoplakia- HHV-8 – Kaposi sarcoma (lymphocytic inflammation)- HPV – squamous cell carcinoma, commonly of anus or cervix

CD4+ count <200mm³:- Histoplasma capsulatum – fever, weight loss, fatigue, cough, dyspnea, nausea, vomiting, diarrhea- HIV – dementia- JC-virus – progressive multifocal leukoencephalopathy - Pnemocystis jirovecii – pneumonia with "ground-glass" opacities on CXR

CD4+ count <100mm³:- Aspergillus fumigatus – hemoptysis, pleuritic pain- Bartonella henselae – Bacillary angiomatosis (neutrophilic inflammation)- Candida albicans – esophagitis- CMV – retinitis, esophagitis, colitis, pneumonitis, encephalitis- Cryptococcus neoformans – meningitis- Cryptosporidium – chronic, watery diarrhea- EBV – B-cell lymphoma- Mycobacterium avium - Toxoplasma gondii – brain abscesses