Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0023241 (Legionella)
 6,990 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Histopathologic examination of lymph nodes from 39 patients with clinical and pathological criteria for cat scratch disease revealed delicate pleomorphic Gram-negative bacilli in 34 of the 39 nodes. They were within the walls of capillaries in or near areas of follicular hyperplasia and within microabscesses. They were best seen with the Warthin-Starry silver impregnation stain. Organisms in lymph node sections exposed to convalescent serum from three patients and to immunoperoxidase stained equally well with all three samples. The organisms did not react with hyperimmune sera to Legionella pneumophila nor to several species of Rickettsia. These bacilli appear to be the causative agents of cat scratch disease.
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PMID:Cat scratch disease: a bacterial infection. 661 49

The proteins associated with the peptidoglycan (PG) of Legionella pneumophila are resistant to proteolysis by trypsin, protease VI and proteinase K. These protease-resistant proteins are associated with the PG noncovalently and covalently. Analysis of cell walls and PG-protein complex by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions revealed one major protein (38.5K) and several minor Coomassie and silver staining components. The 38.5K protein seemed to be a major component which was co-purified with the PG. The cleavage of the PG-protein complex by 1 N NaOH treatment yielded PG free of proteins which was subjected to alkali hydrolysis. This association of PG and protease-resistant covalently-bound proteins may be an important structural and functional determinant of resistance to both environmental conditions and intracellular digestion of L. pneumophila by eukaryotic cells.
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PMID:Partial characterization of peptidoglycan-associated proteins of Legionella pneumophila. 663 Jan 77

The soluble peptides of strains of Legionella pneumophila, Tatlockia micdadei, Fluoribacter bozemanae, Fluoribacter dumoffii, and Fluoribacter gormanii were studied by polyacrylamide gel electrophoresis. Characteristic patterns were seen for Legionella and Tatlockia strains, whereas the patterns for the Fluoribacter strains were variable as would be expected for this genetically heterogeneous group. Grouping by peptide pattern was consistent with proposed taxons based on DNA-DNA homology. By using a new silver stain technique, the sensitivity and ease of pattern recognition were enhanced significantly. This technique is an easily applied general method for distinguishing between strains in epidemiological studies.
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PMID:Electrophoretic characterization of soluble protein extracts of Legionella pneumophila and other members of the family Legionellaceae. 687 4

We describe a 44-year-old man who recently received a cadaveric renal transplant and had a relapse of Legionnaires' disease after an appropriate course of therapy. The relapse occurred within two weeks after completion of a three-week course of therapy with erythromycin stearate. A transbronchial biopsy specimen was positive for Legionella pneumophila by direct immunofluorescence, although the Dieterle silver impregnation stain was negative. The patient responded to a repeated course of erythromycin for an additional 21 days, and no further sequelae or relapses have been noted. The importance of early rapid diagnostic modalities in the immunocompromised patient is emphasized, and the need to consider the possibility of relapse after effective therapy is warranted.
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PMID:Relapse of Legionnaires' disease in a renal transplant recipient. 699 27

One hundred four autopsy cases with previously diagnosed pneumonitis were examined for evidence of Legionnaires' disease. The peak epidemic months of July, August, and September in the five years before the 1977 Vermont epidemic were chosen for study. The bacterium, Legionella pneumophila (serogroup 1) was demonstrated in lung tissue by direct immunofluorescence and the Dieterle silver impregnation stain. There was no clustering of Legionnaires' disease in any one year., The clinical presentation and pulmonary pathology were similar to that of Legionnaires' disease previously reported in Vermont. Seven out of 104 cases were identified as previously undiagnosed Legionnaire's disease. In this time frame, it can be concluded that the disease has been endemic in Vermont.
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PMID:Legionnaires' disease in Vermont. 1972-1976. 731 98

Immunological cross-reactions among Legionella species were investigated with sonicated, proteinase K-digested cell lysates. The antigens separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis were either analyzed for lipopolysaccharides (LPSs) by silver staining or transferred to nitrocellulose membranes for serological characterization with rabbit antibodies directed against Legionella pneumophila serogroups 1 and 5. When antiserum prepared against serogroup 5 was used to probe the LPSs from L. pneumophila serogroups 1 to 14, the antibodies recognized a common epitope harbored by all L. pneumophila serogroups but not by other Legionella species or by the gram-negative bacteria tested as controls. Hence, the serogroup 5 antiserum correctly identified all serogroups of L. pneumophila tested in the LPS immunoblot assay. Moreover, the silver-stained profiles of the isolated LPSs revealed characteristic patterns allowing the identification of the individual serogroups of L. pneumophila.
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PMID:Cross-reacting lipopolysaccharide antigens in Legionella pneumophila serogroups 1 to 14. 776 96

A controlled evaluation was made of the efficacy of copper-silver ionization in eradicating Legionella pneumophila from a hospital water supply. Copper-silver ionization units were installed on the hot water recirculation line of one building with water fixtures positive for Legionella species. Another building with the same water supply served as a control. Legionella species persisted within the system when copper and silver concentrations were < 0.3 and < 0.03 ppm, respectively. When copper and silver concentrations were > 0.4 and > 0.04 ppm, respectively, there was a significant decrease in Legionella species colonization, but the percentage of water fixtures positive for organisms was unchanged in the control building. When the ionization unit was inactivated, water fixtures continued to be free of Legionella species for 2 additional months. Copper-silver ionization can eradicate L. pneumophila in a water distribution system. The advantages of copper-silver ionization include relatively low cost, straightforward installation, easy maintenance, nontoxic by-products and the presence of a disinfecting residual.
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PMID:Controlled evaluation of copper-silver ionization in eradicating Legionella pneumophila from a hospital water distribution system. 813 11

The surface properties of Legionella pneumophila were examined by analyzing outer membrane (OM) proteins, lipopolysaccharides (LPS), and cellular fatty acids after growth within Acanthamoeba polyphaga and in vitro under various nutrient-depleted conditions. Intra-amoeba-grown legionellae were found to differ in several respects from cells grown in vitro; most notably, they contained a 15-kDa OM protein and a monounsaturated straight-chain fatty acid (18:1(9)). These compounds were also found in abundant quantities in the host amoeba. Immunoblot analysis of intra-amoeba-grown legionellae with antiacanthamoebic serum revealed that both the bacterial whole cells and Sarkosyl-extracted OMs contained amoebic antigens. The findings suggest that the 15-kDa OM protein is likely to be of amoebic origin and associates with the OM of the bacterium. It is proposed that disruption of amoebic membranes, as a result of intra-amoebic infection, may liberate macromolecules, including a 15-kDa polypeptide, a major constituent of the amoebic membrane, which adhere to the surface of the legionellae. Growth under specific nutrient depletions also had a significant effect on the surface composition of L. pneumophila. Cells grown under phosphate depletion were markedly sensitive to protease K digestion and contained lower levels of LPS, as observed by silver staining of the digests on polyacrylamide gels. Intra-amoeba-grown cells contained more bands than the in vitro-grown organisms, reflecting further differences in the nature of the LPS. The whole-cell fatty acids of the phosphate-depleted cells were appreciably different from those of cells grown under other nutritional conditions. We found no evidence for expression of iron-regulated OM proteins under iron depletion.
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PMID:Influence of intra-amoebic and other growth conditions on the surface properties of Legionella pneumophila. 833 82

Twelve patients in a large teaching hospital contracted Legionnaires' disease over a period of 11 months. The source was a domestic hot water system in one of the hospital blocks, which was run at a temperature of 43 degrees C. Five different subtypes of Legionella pneumophila serogroup 1 have been isolated from water in different parts of the hospital, over a period of time. Only one subtype, Benidorm RFLP 14, was implicated in disease. Circumstantial evidence suggested that the outbreak may have been due to recent colonization of the hot water system with a virulent strain of Legionella pneumophila. The outbreak was controlled by raising the hot water temperature to 60 degrees C, but careful surveillance uncovered two further cases in the following 30 months. Persistent low numbers of Legionella pneumophila were isolated from the domestic hot water of wards where Legionnaires' disease had been contracted, until an electrolytic unit was installed releasing silver and copper ions into this supply.
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PMID:Outbreak of Legionnaires' disease at University Hospital, Nottingham. Epidemiology, microbiology and control. 843 14

A three-stage chemostat containing a mixed consortium of microorganisms, including Legionella pneumophila, was used to determine the suitability of a silver-containing paint to control biofouling in water systems. The paint was efficient in controlling total surface colonisation by heterotrophic microorganisms and growth of the pathogen over a 2-week period. Biodiversity was limited in the presence of the silver paint and this was thought to help control L. pneumophila numbers. Glass control tiles suspended alongside the silver painted tiles also had reduced colonisation for the 2-week period, suggesting that low levels of silver leached from the paint surface. This loss of silver was confirmed since the inhibition of biofouling and inclusion of the pathogen was not maintained after the 2-week period. Although this paint was unsuitable for controlling biofouling over extended time periods, the data suggest that a reformulated paint or electrochemical method of introducing silver ions may be successful.
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PMID:A paint incorporating silver to control mixed biofilms containing Legionella pneumophila. 860 75


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