title: Pneumocystis jiroveci pneumonia in AIDS patients: reactivation, reinfection or both?
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000453:epidemiology / Q000517:prevention & control*; D000890:Anti-Infective Agents / Q000627:therapeutic use*; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D011020:Pneumonia, Pneumocystis / Q000453:epidemiology / Q000517:prevention & control*; D055502:Secondary Prevention; D012931:Social Environment; D015662:Trimethoprim, Sulfamethoxazole Drug Combination / Q000627:therapeutic use*
chemical_list: D000890:Anti-Infective Agents; D015662:Trimethoprim, Sulfamethoxazole Drug Combination