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Query: UMLS:C0023241 (Legionella)
 6,990 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Seven media were prepared in house or purchased commercially and were compared for their ability to recover Legionella pneumophila from clinical specimens. Media containing alpha-ketoglutarate from either source detected colonies earlier, more often, and in greater quantities than media without alpha-ketoglutarate. Media without charcoal performed poorly.
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PMID:Comparison of media for recovery of clinical isolates of Legionella pneumophila. 388 14

The objective of this study was to evaluate by relatively simple metabolic tests the usefulness of buffers and energy sources commonly used in Legionella growth media. Legionella pneumophila serogroups 1 to 6, Legionella micdadei, and Legionella bozemanii were grown in an enriched charcoal-yeast extract diphasic medium. The cells were washed thrice, suspended in various buffers (pH 6.9) with 1 or 5 mM MgSO4, and used immediately or after controlled-rate cryopreservation. CO2 produced and C incorporated into the cold trichloracetic acid-insoluble fractions from 14C-labeled substrates were determine. Potassium phosphate buffer (0.02 M) was as satisfactory as organic buffers for glutamate metabolism, but the addition of KCl or NaCl reduced activity. Metabolic activity for glutamate was not lost upon cryopreservation, and cryopreserved cells were used to test the utilization of other single or paired substrates. Rates of activity for serine, glutamate, threonine, and pyruvate, in this descending order, were high, and those for alpha-ketoglutarate, succinate, and gamma-aminobutyrate were low. Although glutamine was not used as rapidly as glutamate, when added to glutamate it was preferentially metabolized, possibly because of more rapid transport. When glutamate and serine were combined, glutamate furnished more C for CO2 and less for incorporation, whereas the reverse was true of serine. In conclusion, glutamate as an energy source may in some cases spare other amino acids for synthesis. alpha-Ketoglutarate, a common constituent of Legionella media, may reduce oxygen toxicity but is probably not a chief energy source.
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PMID:Substrate utilization by Legionella cells after cryopreservation in phosphate buffer. 614 14

With 28 beta-lactam antibiotics the susceptibilities of 60 strains of Legionella spp. (49 Legionella pneumophila and 11 ATCC type strains of other Legionella species) were determined. Agar dilution testing was used on buffered charcoal-yeast extract agar to which 0.1% alpha-ketoglutarate was added. The most active of the penicillins tested were ampicillin (MIC = 0.06-8 mg/l) and temocilin (MIC = 0.125 - 16 mg/l); the most active cephalosporins were ceftazidime (MIC = 0.03 - 0.5 mg/l), HR 810 (MIC = 0.06 - 1 mg/l) and cefoxitin (MIC = 0.125 - 2 mg/l). Of all the drugs tested imipenem had the most pronounced activity (MIC = .0075 - 0.06 mg/l).
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PMID:Susceptibility of Legionella spp. to imipenem and 27 other beta-lactam antibiotics. 659 34

Thirty-three strains of Legionella spp., 29 of which were L. pneumophila, were tested for their susceptibilities to erythromycin (EM), rosaramicin, tylosin, mycinamicin I (Sch-27897), and mycinamicin II (Sch-27896). Testing was performed using an agar dilution method with two different types of media: buffered charcoal yeast extract medium supplemented with 0.1% alpha-ketoglutarate (BCYE alpha) and filter-sterilized yeast extract medium with 0.1% alpha-ketoglutarate (BYE alpha). The minimal inhibitory concentrations (MICs) of the drugs tested relative to the MICs of erythromycin were: rosaramicin, MIC approximately equal to 0.2 EM MIC; tylosin, MIC approximately equal to 2 EM MIC; mycinamicin I, MIC approximately equal to 0.5 EM MIC; and mycinamicin II, MIC approximately equal to EM MIC. Both types of media caused equivalent partial inactivation of the macrolides which was apparently due entirely to pH effect. MICs on BCYE alpha were one to five times more than those observed on BYE alpha; this may be due to poorer growth on BYE alpha.
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PMID:Susceptibility of Legionella spp. to mycinamicin I and II and other macrolide antibiotics: effects of media composition and origin of organisms. 712 33

Eighteen types of media, all of which used charcoal yeast extract medium as a base, were tested for their ability to support the growth of a stock strain of Legionella pneumophila. Fifteen of these contained antimicrobial agents. Five antibiotic-containing media which performed best in growing the stock strain were then tested for the ability to grow L. pneumophila from clinical respiratory tract specimens. One of the media, BMPA alpha, which contained cefamandole, polymyxin B, anisomycin, an organic buffer, and alpha-ketoglutarate, performed from contaminated clinical specimens and, in conjunction with an acid wash treatment, facilitated recovery of the bacterium from potable water.
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PMID:Improved semiselective medium for isolation of Legionella pneumophila from contaminated clinical and environmental specimens. 728 86

The culture conditions of Afipia felis, A. broomeae, A. clevelandensis and three unnamed Afipia genospecies were investigated on BCY agar supplemented with different substances known as growth factors of Legionella spp. and, furthermore, with sodium chloride and other salts. The organisms were found to be susceptible to a certain degree to byproducts of the autoclaving which are scavenged by activated by charcoal. Growth was weakly enhanced by ferric pyrophosphate, cystein.HCl, and alpha-ketoglutarate. These substances are no obligatory growth factors. The optimal pH value was about 6.8. Afipia spp. showed a strong susceptibility to NaCl and other salts. They possess phosphatase, phosphoamidase, phosphodiesterase, a weak sulfatase, glycine aminopeptidase, and L-lysine aminopeptidase. The strains differed with regard to other proteases and aminopeptidases. The decimal reduction times of A. felis at 55 degrees C and 60 degrees C were 11 min, < 1 min, respectively.
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PMID:Investigations of culture and properties of Afipia spp. 773 25

Although Legionella spp. are often isolated from natural aquatic habitats, outbreaks of legionellosis are rarely traced to these sources. To determine the fate of Legionella pneumophila in the environment, filtered and unfiltered river water and seawater microcosms, incubated at 4 degrees C and 26 degrees C, were inoculated with [3H]thymidine-labeled L. pneumophila cells. Survival in these microcosms was monitored using [3H]thymidine labeling and culture on buffered-charcoal yeast extract agar amended with alpha-ketoglutarate (BCYE alpha). Immunofluorescent microscopy, direct fluorescent antibody staining, and acridine orange direct counts were also employed. To assess effects of grazing on Legionella, a duplicate set of samples was filtered through 2.0-microns Nuclepore filters to trap large protozoa. Over the test period, in the microcosms incubated at 4 degrees C, the culturable counts decreased ca. 1 log on BCYE alpha agar, with no substantial decline in thymidine count. Autoclaved seawater and river water controls held at 15 degrees C also showed no change in thymidine count. At 26 degrees C, a 3-log decline was observed in culturable counts, with ca. 1-log decline in thymidine counts. These results indicate that, although culturability declined by one to three orders of magnitude, when L. pneumophila microcosms were incubated at 4 degrees C and 26 degrees C, the cells remained metabolically active for extended periods, especially at 4 degrees C.
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PMID:Effect of temperature on survival of Legionella pneumophila in the aquatic environment. 826 Nov 69

Growth of Legionella spp. on buffered charcoal yeast extract medium supplemented with alpha-ketoglutarate and formulated with 3-(n-morpholino)propanesulfonic acid (MOPS), 3-(n-morpholino)-2-hydroxypropanesulfonic acid (MOPSO), or n-(2-acetamido)-2-aminoethanesulfonic acid (ACES) buffer was similar. With three exceptions, growth was no different in buffered yeast extract broth supplemented with alpha-ketoglutarate and formulated with MOPS or ACES buffer.
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PMID:Comparison of three buffers used in the formulation of buffered charcoal yeast extract medium. 830 31

The growth of 18 different Legionella sp. strains and 76 different yeast isolates was tested on buffered charcoal yeast extract medium supplemented with alpha-ketoglutarate (BCYE alpha medium) and with natamycin, an antifungal agent. Bacterial growth was no different on BCYE alpha medium made with or without natamycin, whereas complete inhibition of yeasts occurred in BCYE alpha medium containing 200 to 500 micrograms of natamycin per ml. Selective BCYE alpha media made with natamycin rather than anisomycin had no (formulation with vancomycin, polymyxin B, and agar) or little (formulation with cefamandole, polymyxin B, and agar) inhibitory effect on the growth of 14 different Legionella sp. bacteria. Natamycin is an inexpensive alternative to anisomycin in the formulation of selective BCYE alpha media.
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PMID:Natamycin as a selective antifungal agent in media for growth of Legionella spp. 874

The in-vitro activities of moxifloxacin, ciprofloxacin, erythromycin and rifampicin against 49 Legionella spp. isolates were determined by an agar dilution method with buffered charcoal yeast extract agar containing alpha-ketoglutarate. Because the inhibitory effects of charcoal in the test media were pronounced (92% for quinolones, 90.5% for rifampicin and 92.5% for erythromycin), the MICs were corrected for the charcoal-bound fraction of the antibiotics. The corrected geometric mean MICs were 0.018 mg/L for moxifloxacin, 0.02 mg/L for ciprofloxacin, 0.27 mg/L for erythromycin and 0.005 mg/L for rifampicin.
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PMID:The in-vitro activity of moxifloxacin against Legionella species and the effects of medium on susceptibility test results. 1038 72


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