References of "Losson, Bertrand"
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See detailVaccination against dermatophytosis in domestic animals : Past, present and future
Mignon, Bernard ULg; Vermout, S.; Tabart, J. et al

Conference (2006)

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See detailBluetongue in northern Europe.
Thiry, Etienne ULg; Saegerman, Claude ULg; Guyot, Hugues ULg et al

in Veterinary Record : Journal of the British Veterinary Association (2006), 159(10), 327

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See detailUltrastructural morphology of the male and female genital tracts of Psoroptes spp. (Acari : Astigmata : Psoroptidae)
Lekimme, Mireille ULg; Leclercq-Smekens, M.; Devignon, C. et al

in Experimental & Applied Acarology (2005), 36(4), 305-324

The structure of the male and female genital systems of the astigmatid mite Psoroptes ovis (Hering) is described. The male genital system is composed of a paired testis, fused at its proximal part, two ... [more ▼]

The structure of the male and female genital systems of the astigmatid mite Psoroptes ovis (Hering) is described. The male genital system is composed of a paired testis, fused at its proximal part, two vasa deferentia, an ejaculatory duct, into which a single accessory gland opens, and a copulatory organ. The testis is characterized by a peripheric syncytial cell surrounding spermatogonia, spermatocytes, spermatids and spermatozoa which are distributed regularly in the gonad according to the sequence of spermatogenesis. The female genital system consists of a copulatory pore (the bursa copulatrix), a seminal receptacle, paired ovaries and oviducts, a glandular uterus and an ovipositor which leads to the oviporus. Ovaries are composed of somatic cells, germ cells and a central cell, with a multilobular nucleus, connected to oocytes by a stalk. Similarities with other astigmatic mites belonging to Psoroptidia and Acaridia are also discussed. [less ▲]

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See detailClinical, pathological and diagnostic aspects of congenital neosporosis in a series of naturally infected calves
de Meerschman, F.; Focant, Charles ULg; Detry, Jacques et al

in Veterinary Record : Journal of the British Veterinary Association (2005), 157(4), 115-118

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See detailDetection of Echinococcus multilocularis in wild boars in France using PCR techniques against larval form
Boucher, J. M.; Hanosset, R.; Augot, D. et al

in Veterinary Parasitology (2005), 129(3-4), 259-266

Recently, new data have been collected on the distribution and ecology of Echinococcus multilocularis in European countries. Different ungulates species such as pig, goat, sheep, cattle and horse are ... [more ▼]

Recently, new data have been collected on the distribution and ecology of Echinococcus multilocularis in European countries. Different ungulates species such as pig, goat, sheep, cattle and horse are known to host incomplete development of larval E. multilocularis. We report a case of E. multilocularis portage in two wild boars from a high endemic area in France (Department of Jura). Histological examination was performed and the DNA was isolated from hepatic lesions then amplified by using three PCR methods in two distinct institutes. Molecular characterisation of PCR products revealed 99% nucleotide sequence homology with the specific sequence of the U1 sn RNA gene of E. multilocularis, 99 and 99.9% nucleotide sequence homology with the specific sequence of the cytochrome oxydase gene of Echinococcus genus and 99.9% nucleotide sequence homology with a genomic DNA sequence of Echinococcus genus for the first and the second wild boar, respectively. (c) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailDes champignons pour lutter contre les insectes et les acariens
Lekimme, Mireille ULg; Mignon, Bernard ULg; Losson, Bertrand ULg

in Point Vétérinaire (2005), 36(254), 12-13

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See detailA longitudinal epidemiological survey of bovine trypanosomosis and its vectors in the White Volta river basin of Northern Ghana
Mahama, C. I.; Desquesnes, M.; Dia, M. L. et al

in Veterinary Parasitology (2005), 128(3-4), 201-208

A longitudinal epidemiological survey of bovine trypanosomosis and its vectors was carried out in the Volta river basin of Northern Ghana to determine the relationship between cattle management and the ... [more ▼]

A longitudinal epidemiological survey of bovine trypanosomosis and its vectors was carried out in the Volta river basin of Northern Ghana to determine the relationship between cattle management and the incidence of bovine trypanosomosis. Two groups of sentinel cattle under different systems of management, classified as "fully-sedentary" and "partially-sedentary" (depending on the type of management) were followed over a 1-year period starting from March 2003 onwards. Cattle were screened at intervals of 3 months using the huffy coat technique (BCT). Buffy coat specimen from animals that were positive for the BCT and those that were negative, but with a packed cell volume (PCV) of less than 21% were further tested using the polymerase chain reaction (PCR). Plasma from all animals were tested for antibody using the indirect antibody enzyme-linked immunosorbent assay (ELISA). Trypanosomosis challenge was determined in tandem with the epidemiological survey with watering sites of sentinel cattle being the foci of interest. The parasitological prevalence at the start of the survey was higher in the fully-sedentary group (9%) than in the partially-sedentary group (3%). In subsequent visits, however, the parasitological incidence was consistently higher in the partially-sedentary group than in the fully-sedentary group. The mean seroprevalence (ELISA) of both groups increased from 3% in March to 54% in December. Statistical analysis of the serological results using a random effect logistic regression, showed a significant difference in incidence of bovine trypanosomosis between the two groups. There was also a significant effect of time. The influence of cattle herding on host-vector-parasite interface and its consequence on the incidence of trypanosomosis are discussed. (c) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailInfluence of an experimental Trypanosoma congolense infection and plane of nutrition on milk production and some biochemical parameters in West African Dwarf goats
Faye, D.; Fall, A.; Leak, S. et al

in Acta Tropica (2005), 93(3), 247-257

The interactions of trypanosomosis and plane of nutrition on health and productivity of multiparous and primiparous West African Dwarf (WAD) does were studied in a multi-factorial experiment including ... [more ▼]

The interactions of trypanosomosis and plane of nutrition on health and productivity of multiparous and primiparous West African Dwarf (WAD) does were studied in a multi-factorial experiment including diet (supplementation or basal diet) and infection (infected or control). Experimental does were infected with Trypanosoma congolense at the beginning of the second week post-kidding and monitored for 16 weeks after infection. Trypanosome infection significantly reduced packed cell volume (PCV) (control: 30.1 +/- 0.3% versus infected: 22.2 +/- 0.3%; P < 0.0001). Regardless of infection, the drop in PCV from the pre-infection period to the end of the experiment was more severe in animals under restricted diet (interaction diet x period, P < 0.001). Trypanosome parasitaemia tended to be higher in the supplemented group than in the basal diet group (P > 0.05) and multiparous animals had a higher parasitaemia (score: 2.6 +/- 0.1) than primiparous animals (score: 2.2 +/- 0.1) (P < 0.05). Trypanosome infection as well as dietary supplement had a significant effect on lactation length. Milk off-take from trypanosome-infected does was significantly lower than that from the uninfected control group (17.5 +/- 3.21 versus 35.5 +/- 3.21, P < 0.001) and there was a positive effect of plane of nutrition (supplemented: 32.8 +/- 3.21 and basal diet: 20.2 +/- 3.51, P = 0.01). The drop in milk off-take due to trypanosome infection was more severe in the supplemented group (control: 46.7 +/- 4.71 versus infected: 18.9 +/- 4.21) than in the group receiving a basal diet (control: 24.2 +/- 5.01 versus infected: 16.1 +/- 4.71) (interaction infection x diet, P = 0.04) due to the number of does from the supplemented group that were withdrawn from the experiment. The effect of trypanosome infection on doe's live-weight was only noticeable during the first 8 weeks of lactation and there was no significant effect on offspring growth rate unless the mother died. Plasma total protein (TP), albumin and cholesterol concentrations were significantly reduced by the infection but were significantly increased by supplementation. Supplemented does had a higher level of cholesterol and a tendency for a higher parasitaemia. Does of high parity also had a higher cholesterol level than primiparous does and, based on the number of animals that were withdrawn from the experiment, they showed a lower resistance to the infection. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailIn vivo m-RNA expression analysis of Microsporum canis secreted subtilisin-like serine proteases in feline dermatophytosis
Mignon, Bernard ULg; Vermout, Sandy; Brouta, F. et al

in Advances in Veterinary Dermatology (2005)

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See detailSnail diversity in small water bodies and its potential implication on the epidemiology of fasciolosis in Belgium
Caron, Yannick ULg; Lasri, Saadia; Gillardin, V. et al

Conference (2005)

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See detailAn improved ELISA technique for the diagnosis of Psoroptes ovis infestations in cattle
Lonneux, J. F.; Mignon, Bernard ULg; Bossaert, K. et al

Poster (2005)

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See detailIn vitro activity of Beauveria bassiana against Psoroptes ovis
Lekimme, M.; Mignon, Bernard ULg; Focant, C. et al

Poster (2005)

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See detailBiological control of Psoroptes ovis using entomopathogenic fungi
Lekimme, M.; Mignon, Bernard ULg; Focant, C. et al

Poster (2005)

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See detailBovine pepsinogen and Prochymosin : Current knowledge, applications and outlines in the management of gastrointestinal worms
Sidikou, I. D.; Remy, B.; Hornick, Jean-Luc ULg et al

in Annales de Médecine Vétérinaire (2005), 149(4), 213-228

The characterization of the gastric aspartic proteases and the understanding of their mechanisms of activation led to several applications in many domains as the use of chymosin in cheese industries and ... [more ▼]

The characterization of the gastric aspartic proteases and the understanding of their mechanisms of activation led to several applications in many domains as the use of chymosin in cheese industries and the diagnostic of gastric diseases in humans and animals. Particularly, in cattle, the indirect measurement of pepsinogen activity is largely used for the diagnosis of ostertagiosis. Today, the gastric strongyloses are responsible for serious problems of management or the emergence of parasites resistence towards antihelminthics, and no immediate solution is available. Nevertheless, several tracks are proposed such as a more rational use of antihelminthics by the study of blood pepsinogen. This approach held our attention. The present review describes bovine pepsinogen and prochymosin, with an accent on the zymogen structure, their mechanisms of activation and the methods of blood levels measurement. The manuscript will end on the importance of the problems raised by gastric worms, and on the interest of the measurement of blood pepsinogen in the management of these diseases in cattle. [less ▲]

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See detailQuand suspecter une infestation parasitaire à manifestation cutanée chez les ruminants laitiers?
Losson, Bertrand ULg; Mignon, Bernard ULg

in Bulletin des Groupements Techniques Vétérinaires (2005), (Hors série), 233-240

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See detailManagement of myiasis: current status and future prospects
Colwell, D. D.; Dorchies, P.; Scholl, P. J. et al

in Veterinary Parasitology (2004), 125(1-févr Sp. Iss. SI), 93-104

The management of myiasis in livestock has been an example of the success of modem chemical approaches for parasite control, yet in some cases remains extremely intractable, requiring the development of ... [more ▼]

The management of myiasis in livestock has been an example of the success of modem chemical approaches for parasite control, yet in some cases remains extremely intractable, requiring the development of novel strategies. In addition, the growing and urgent need to develop integrated strategies that enhance the sustainability of livestock production systems drives the search for new techniques [see Int. J. Parasitol. 29 (1999) 7]. The following summary represents a synthesis of a symposium presented at the 19th International Conference of the World Association for the Advancement of Veterinary Parasitology, New Orleans, USA, 10-14 August 2003. The coverage began with a review of the need for more subtle economic analysis of the impact of myiasis based on the use of the sterile insect technique (SIT) for control of bovine hypodermosis in North America. This was followed by a review of the status of chemical control with particular emphasis on the macrocyclic lactones. The outcome of the use of these compounds in a regulated control program for eradication of bovine hypodermosis in EU was surveyed. Similarly, the success of the screwworm eradication program, using the sterile insect technique has shown how effective this approach can be given the appropriate target. Several aspects of the development of newer approaches were surveyed in discussion of newer chemical control products, development of vaccines, use of host genetics, use of predictive simulation modelling and trapping for monitoring and control and the development of new diagnostic approaches for occult infestations. Finally, use of the latest molecular tools for identification of larvae causing myiasis and their use for the identification of species coming from different and distant geographical areas to colonize regions where they have been eradicated was reviewed. [less ▲]

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See detailHerd-level seroprevalence and risk-mapping of bovine hypodermosis in Belgian cattle herds
Haine, D.; Boelaert, F.; Pfeiffer, D. U. et al

in Preventive Veterinary Medicine (2004), 65(1-2), 93-104

Our objective was to determine the seroprevalence of Hypoderma spp. and to develop a spatial model describing the risk surface of warble-fly infection in Belgian cattle herds (adjusting for herd size ... [more ▼]

Our objective was to determine the seroprevalence of Hypoderma spp. and to develop a spatial model describing the risk surface of warble-fly infection in Belgian cattle herds (adjusting for herd size, herd type, local temperature, rainfall, relative air humidity and land-cover). This survey was carried out in 390 selected herds of all types (dairy, mixed and beef) from December 1997 to March 1998, which were included in a national infectious bovine rhinotracheitis and paratuberculosis (Johne's-disease) survey. All animals >24 months old were blood sampled and an ELISA was used on pooled serum samples (10 animals per pool). The herd seroprevalence was 48.7% (95% confidence interval: 43.6-53.8); positive herds were mainly in the south of the country and along the North Sea coast. The logistic multiple-regression model of herd-level seropositivity indicated that mixed-type and beef-cattle herds have more than four-fold and two-fold increases in the odds of being Hypoderma-positive, respectively, compared with dairy herds. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

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