Idiopathic CD4+ T-lymphocytopenia differs from HIV infection in its immunologic characteristics and in its apparent lack of progression over time. Nothing about the immunologic or viral-culture studies performed in these patients or about their family members or blood donors suggests that a transmissible agent causes this condition.

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Various sources of Pseudomonas paucimobilis bacterial infections have been documented. We report the third human case of bloodstream infection due to P. paucimobilis and review the literature in English regarding community-acquired and nosocomial infection due to this bacterium. Biochemical and genetic characteristics supporting the pathogenic potential of P. paucimobilis are presented, and the antibiotic susceptibility profile of the organism is summarized. Pseudomonas paucimobilis, formerly categorized as CDC group IIk, biotype 1, was accorded taxonomic status in 1977 (10). It is a gram-negative, aerobic, motile bacterium with a polar flagellum. The appellation paucimobilis derived from the observation that few cells are actively motile in broth culture, thereby making bacterial motility a difficult characteristic to demonstrate. It can be misidentified as a Flavobacterium species because of its production of a yellow pigment that has been biochemically characterized as a carotenoid (12). P. paucimobilis demonstrates a diverse nutritional substrate spectrum (6) and grows at 37°C, but not at 5 or 42°C, with optimal growth occurring at 30°C (16). Recent reports document the heterogeneity of fatty acid composition (4) and DNA homology (15) between P. paucimobilis and the bacteria constituting group Ilk, biotype 2 (Flavobacterium species). Such findings underscore the limited taxonomic proximity of these organisms. The dissimilarity between P. paucimobilis and other pseudomonads was highlighted by Smalley and Ourth (22), who used crude