There are a large number of Pseudomonas species, the most important of which is P. aeruginosa. The total number of infections produced by the other species is far lowerthan that produced by P. aeruginosa alone. Pseudomonas species are most frequently seen as colonizers and contaminants but are able to cause opportunistic infections. The assignment of species names has little clinical importance beyond differentiation from P. aeruginosa. Reports vary regarding the frequency of their isolation from cases of bac-teremia, arthritis, abscesses, wounds, conjunctivitis, and urinary tract infections. In gen-eral, unless isolated in pure culture from a high-quality (direct) specimen, it is difficult to attach pathogenic significance to any of the miscellaneous Pseudomonas species.
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