ABSTRACT
The distribution of Pseudomonas aeruginosa in navigation pool 8 of the upper Mississippi River was investigated by acetamide broth enrichment of water, sediment, and swab (solid-water interface) samples. Among the 152 P. aeruginosa isolates, serological type 1 was most prevalent (34.2%), and a small number (13.2%) showed carbenicillin resistance. Pigmentation was variable, with only 44.7% elaborating typical blue-green pigment. P. aeruginosa was most commonly isolated from sediment, with solid-water interfaces (aufwuchs samples) also exhibiting high frequencies of isolation. Current velocity, oxygen and nutrient availability, surface tension, desiccation, and negative phototropism were important factors in the riverine distribution of this epibacterium.
Subject(s)
Pseudomonas aeruginosa/isolation & purification , Water Microbiology , Animals , Anti-Bacterial Agents/pharmacology , Fishes/microbiology , Fresh Water , Minnesota , Pigmentation , Pseudomonas aeruginosa/classification , Pseudomonas aeruginosa/physiology , Serotyping , Soil Microbiology , WisconsinABSTRACT
A chronic septic process developed in the right knee of an elderly man with advanced degenerative arthritis of both knees. Open exploration, culture, and biopsy of the joint found that the pathogen was Corynebacterium pyogenes and that the synovium was involved with a remarkable perivascular infiltrate of plasma cells. Serum protein electrophoresis demonstrated a prominent M component. Following antimicrobial therapy, the M protein level has gradually declined, and no evolution of multiple myeloma has become apparent. The findings are consistent with a benign monoclonal gammopathy and localized plasmacytic reaction in the knee associated with infection by an unusual diphtheroid organism.
