... are sometimes causes of FUO in this group. While the duration of illness may be short in these patients, the consequences of untreated infection may be catastrophic; 50–60% of febrile neutropenic ... >80% of HIV-infected patients, but drug fever and lymphoma remain important considerations. Treatment of HIV-associated FUO depends on many factors and is discussed in Chap. 182. Fever of Unknown ... The pace of diagnostic tests is accelerated, and the threshold for procedures—CT scans, ultrasonography, 111In WBC scans, noninvasive venous studies—is low. Even so, 20% of cases of nosocomial...