Staphylococcus warned Staphylococcus warneri Yellow colonies develop on Sal

Staphylococcus warned staphylococcus warneri yellow

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Staphylococcus warned Staphylococcus warneri Yellow colonies develop on Sal Mannitol medium. Cells comprise catalase- positive, oxidase-negative, facultatively anaerobic. Gram-positive cocci, which produce arginine dihydrolase, P-glucosidase and urease, but not alkaline phosphatase, and does not reduce nitrates. Acid is produced from sucrose and trehalose, but not from L-arabinose, lactose, mannitol, mannose, raffinose, ribose or xylose (Gil et al, 2000). The characteristics of the organism were considered by Gil et al. (2000) to match the description of Sta. warneri. MISCELLANEOUS GRAM-POSITIVE BACTERIAL PATHOGEN "Candidatus Arthromitus" The digestive tract of fish was observed to be full of filamentous. Gram-positive/ variable organisms with metachromatic granules and endospores (Michel et al., 2002a).
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4 Characteristics of the pathogens: Gram-negative bacteria Some Gram-negative bacteria have been described as fish pathogens with Uttle if any supportive evidence. Consequently, a question mark hangs over whether or not such organisms should be regarded as bona fide pathogens. In the following text, it will become apparent that varying amounts of information are available for the Gram-negative bacterial fish pathogens. For some, e.g. Aer. salmonicida, a wealth of information is available. Unfortunately, for others, such as Aer. hes- tianim, barely enough information is available to enable scientists to recognise fresh isolates. Aeromonadaceae representatives Aeromonas is classified in the family Aeromonadaceae (Colwell et ai, 1986). Aeromonas allosaccharophila During an examination of 16S rRNA sequences of motile aeromonads, two isolates, which were originally recovered from diseased elvers in Spain during 1988, were considered as sufficiently distinct from existing species to warrant description as a new species, Aer. allosaccharophila (Martinez-Murcia et al., 1992). However, it is recognised that isolates are phenetically heterogeneous (Huys et al., 2001). A eromon as alio sac char oph ila Cultures comprise Gram-negative, motile, fermentative rods, which produce cat- alase, P-galactosidase, indole, lysine decarboxylase and oxidase but not H2S, reduce nitrates, degrade casein, DNA, egg yolk, gelatin, starch and Tween 80 but not elastin, sodium dodecyl sulphate or urea, and grow in 0-3% (w/v) sodium
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82 Bacterial Fish Pathogens chloride, at 4-42°C and at pH 9.0. The Voges Proskauer reaction is negative. Acid is produced from D-cellobiose, D-galactose, glucose (plus gas), glycerol, maltose, D-mannitol, D-mannose and D-trehalose, but not from adonitol, arbutin, dulcitol, m-erythritol, m-inositol, lactose, salicin, D-sorbitol or D-xylose. A wide range of compounds are utilized as sole sources of carbon for energy and growth, including L-arabinose, L-arginine, D-cellobiose, fumarate, D-galactose, D-gluconate, L-glutamate, glycerol, L-histidine, maltose, D-mannitol, D-man- nose, L-proline, succinate, sucrose and D-trehalose, but not L-alanine, y-amino- butyrate, L-citrulline, dulcitol, m-erythritol, ethanol, D-glucuronate, L-glutamine, glycine, DL-3-hydroxybutyrate, m-inositol, ot-ketoglutarate, lactose, L-leucine, propionate, putrescine, salicin or L-serine. Susceptibility has been recorded to
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  • Spring '20
  • Bacteria, representative, gram-negative bacteria

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