6 results on '"Koen Chiers"'
Search Results
2. First isolation ofVibrio tapetisand an atypical strain ofAeromonas salmonicidafrom skin ulcerations in common dab (Limanda limanda) in the North Sea
- Author
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Leslie Bosseler, Hans Polet, Sabela Balboa, Annelies Declercq, E. De Swaef, Annemie Decostere, Lisa Devriese, Maaike Vercauteren, Filip Boyen, Koen Chiers, Jesús L. Romalde, and Snorre Gulla
- Subjects
Male ,0301 basic medicine ,Serotype ,Veterinary (miscellaneous) ,Ruditapes ,Aeromonas salmonicida ,Flounder ,Aquatic Science ,Biology ,Skin Diseases ,Microbiology ,Fish Diseases ,03 medical and health sciences ,Flatfish ,Belgium ,Animals ,Limanda ,Vibrio ,Strain (chemistry) ,Common dab ,04 agricultural and veterinary sciences ,biology.organism_classification ,Isolation (microbiology) ,030104 developmental biology ,Vibrio Infections ,040102 fisheries ,0401 agriculture, forestry, and fisheries ,Female ,North Sea ,Gram-Negative Bacterial Infections - Abstract
Skin ulcerations rank amongst the most prevalent lesions affecting wild common dab (Limanda limanda) with an increase in prevalence of up to 3.5% in the Belgian part of the North Sea. A complex aetiology of these ulcerations is suspected, and many questions remain on the exact factors contributing to these lesions. To construct the aetiological spectrum of skin ulcerations in flatfish, a one-day monitoring campaign was undertaken in the North Sea. Fifteen fish presented with one or more ulcerations on the pigmented and/or non-pigmented side. Pathological features revealed various stages of ulcerations with loss of epidermal and dermal tissue, inflammatory infiltrates and degeneration of the myofibers bordering the ulceration, albeit in varying degrees. Upon bacteriological examination, pure cultures of Vibrio tapetis were retrieved in high numbers from five fish and of Aeromonas salmonicida in one fish. The V. tapetis isolates showed cross-reactivity with the sera against the representative strain of serotype O2 originating form a carpet-shell clam (Ruditapes descussatus). Moreover, the A. salmonicida isolates displayed a previously undescribed vapA gene sequence (A-layer type) with possible specificity towards common dab. Further research is necessary to pinpoint the exact role of these agents in the development of skin ulcerations in common dab.
- Published
- 2017
3. Saddleback syndrome in European sea bassDicentrarchus labrax(Linnaeus, 1758): anatomy, ontogeny and correlation with lateral-line, anal and pelvic fin abnormalities
- Author
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Dominique Adriaens, Stefanos Fragkoulis, P Kokkinias, Koen Chiers, George Koumoundouros, and H Paliogiannis
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0301 basic medicine ,Veterinary (miscellaneous) ,Ontogeny ,media_common.quotation_subject ,Lateral line ,Aquaculture ,Aquatic Science ,03 medical and health sciences ,medicine ,Animals ,Metamorphosis ,Sea bass ,media_common ,biology ,Ossification ,04 agricultural and veterinary sciences ,Anatomy ,biology.organism_classification ,Lateral Line System ,Dorsal fin ,030104 developmental biology ,Animal Fins ,040102 fisheries ,0401 agriculture, forestry, and fisheries ,Bass ,Dicentrarchus ,medicine.symptom ,Abnormality - Abstract
This study focused on the anatomy and ontogeny of saddleback syndrome (SBS) in reared European sea bass. The abnormality was detected at an unusually high frequency (12-94%) during a routine quality control in a commercial hatchery. Anatomically the abnormality was mainly characterized by the loss of 1-5 hard spines and severe abnormalities of the proximal pterygiophores (anterior dorsal fin), size reduction of a few lepidotrichia, missing lepidotrichia and/or lepidotrichia of poor ossification (posterior dorsal fin). SBS was significantly correlated with abnormalities of the anal and pelvic fins in all the examined populations. Moreover, in juvenile fish, SBS was significantly correlated with an abnormal lack of sectors of the lateral line. The examination of early larval samples revealed that SBS was ontogenetically associated with severe abnormalities of the primordial marginal finfold, which developed at the flexion stage (ca 8.5-11.0 mm SL). Histologically, these abnormalities were associated with extensive epidermal erosion. The results are discussed in respect of the critical ontogenetic period and the possible causative factors of SBS in European sea bass. It is suggested that causative factors acted during a wide ontogenetic period including flexion and metamorphosis phases.
- Published
- 2016
4. In vitromarkers for virulence inYersinia ruckeri
- Author
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Els Tobback, Annemie Decostere, Koen Chiers, Freddy Haesebrouck, K. Hermans, and W. Van den Broeck
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Gills ,Yersinia ruckeri ,endocrine system ,Cytochalasin D ,animal structures ,Yersinia Infections ,intracellular survival ,animal diseases ,Veterinary (miscellaneous) ,INVASION ,Carbohydrates ,Intracellular Space ,Virulence ,ADHESION ,Aquatic Science ,Bacterial Adhesion ,serum resistance ,Cell Line ,SERUM ,Microbiology ,Fish Diseases ,BINDING ,Animals ,Veterinary Sciences ,adherence ,Nucleic Acid Synthesis Inhibitors ,biology ,Liver cell ,Periodic Acid ,Fishes ,Proteolytic enzymes ,biology.organism_classification ,Mucus ,Tubulin Modulators ,Enzymes ,Oncorhynchus mykiss ,FISH EPITHELIAL-CELLS ,BACTERIA ,Microscopy, Electron, Scanning ,Rainbow trout ,Mitogens ,Colchicine ,CYTOCHALASIN-D ,Biomarkers ,Bacteria ,Intracellular - Abstract
In this study, different traits that have been associated with bacterial virulence were studied in Yersinia ruckeri. Two isolates that had been shown to cause disease and mortality in experimentally infected rainbow trout were compared with five avirulent isolates. Both virulent isolates showed high adhesion to gill and intestinal mucus of rainbow trout, whereas the majority of non-virulent strains demonstrated significantly lower adhesion. A decrease in adherence capability following bacterial treatment with sodium metaperiodate and proteolytic enzymes suggested the involvement of carbohydrates and proteins. All strains were able to adhere to and invade chinook salmon embryo cell line (CHSE-214), fathead minnow epithelial cell line (FHM) and rainbow trout liver cell line (R1). One non-virulent strain was highly adhesive and invasive in the three cell lines, whereas the virulent strains showed moderate adhesive and invasive capacity. The internalization of several isolates was inhibited by colchicine and cytochalasin-D, suggesting that microtubules and microfilaments play a role. For all strains, intracellular survival assays showed a decrease of viable bacteria in the cells 6 h after inoculation, suggesting that Y. ruckeri is not able to multiply or survive inside cultured cells. Analysis of the susceptibility to the bactericidal effect of rainbow trout serum demonstrated that virulent Y. ruckeri strains were serum resistant, whereas non-virulent strains were generally serum sensitive.
- Published
- 2010
5. White necrotic tail tips in estuary seahorses, Hippocampus kuda, Bleeker
- Author
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W. Van den Broeck, Dominique Adriaens, Anamaria Rekecki, Koen Chiers, Annelies Declercq, Annemie Decostere, Freddy Haesebrouck, and S Teerlinck
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Tail ,geography ,White (horse) ,geography.geographical_feature_category ,biology ,Veterinary (miscellaneous) ,Molecular Sequence Data ,Hippocampus kuda ,Estuary ,Ciliophora Infections ,Sequence Analysis, DNA ,Aquatic Science ,DNA, Protozoan ,biology.organism_classification ,Smegmamorpha ,Fishery ,Fish Diseases ,Necrosis ,Seahorse ,Oligohymenophorea ,RNA, Ribosomal, 16S ,Tenacibaculum maritimum ,Animals ,Tenacibaculum - Published
- 2013
6. Yersinia ruckeri infections in salmonid fish
- Author
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Els Tobback, Koen Chiers, Annemie Decostere, Katleen Hermans, and Freddy Haesebrouck
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Yersinia ruckeri ,biology ,Yersinia Infections ,business.industry ,Virulence Factors ,Veterinary (miscellaneous) ,Enteric redmouth disease ,Virulence ,Yersiniosis ,Disease ,Aquatic Science ,Salmonid fish ,Environment ,biology.organism_classification ,medicine.disease ,Microbiology ,Pathogenesis ,Fish Diseases ,Aquaculture ,Immunology ,medicine ,Animals ,business ,Salmonidae - Abstract
Yersinia ruckeri is the causative agent of yersiniosis or enteric redmouth disease leading to significant economic losses in salmonid aquaculture worldwide. Infection may result in a septicaemic condition with haemorrhages on the body surface and in the internal organs. Despite the significance of the disease, very little information is available on the pathogenesis, hampering the development of preventive measures to efficiently combat this bacterial agent. This review discusses the agent and the disease it causes. The possibility of the presence of similar virulence markers and/or pathogenic mechanisms between the Yersinia species which elicit disease in humans and Y. ruckeri is also examined.
- Published
- 2007
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