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1426 - 1450 of 1524
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The study objectives were to investigate Salmonella prevalence, serovar distribution, and risk factors for shedding in 10 purposively selected farrow-to-finish farms in Saskatchewan and Alberta. Pooled fecal samples from the breeding and growfinish phases and individual fecal samples from breeding, ...
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Experimental infections with Piscirickettsia salmonis via intraperitoneal (IF), oral (PO) and gill (GS) routes were compared, and the importance of physical contact in the horizontal transmission of this organism was investigated. Atlantic salmon, Salmo salar L., under-yearling parr raised in fresh ...
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Stunting syndrome (SS) is a viral enteric disease of turkey poults. The aetiologic agent (stunting syndrome agent [SSA]) of this disease has been reported recently. In vitro propagation of SSA was examined in primary cells, various continuous cell lines, and embryonated eggs. Turkey embryos inoculat...
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This report describes a new syndrome affecting farmed Atlantic salmon on the Canadian east coast that has resulted in increased morbidity and mortality in affected stocks. The major pathological findings are apparent only microscopically and include renal interstitial haemorrhage and acute tubular n...
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Drugs used in aquaculture cover a wide range of chemotherapeutic compounds including basic chemicals, hormones, antibacterials and pesticides. The decision to treat an aquaculture product is complicated by the lack of pharmacokinetic data available on fish. Methods of drug administration, routes of ...
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Crows (Corvus brachyrhynchos) were experimentally infected with Diplotriaena tricuspis (50 to 530 larvae/bird) and killed at intervals from 4 to 291 days afterwards. The larvae caused traumatic lesions during their movements through the hepatic portal system. Giant cell granulomata surrounded dead n...
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Fourier-transform infrared microscopic spectra of scrapie-infected nervous tissue measured at high spatial resolution (~6 micro m) were compared with those obtained from the purified, partly proteinase K digested scrapie isoform of the prion protein isolated from nervous tissue of hamsters infected ...
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Tissue samples and feces were collected from a dead, adult female coyote (Canis latrans) found at the side of the road in late March 2003 in the Avalon Peninsula region of Newfoundland, Canada. The coyote apparently died of vehicular-related trauma. Samples of lung, brain, heart, liver, and kidney w...
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Bacterial diseases of the gills of commercially reared salmonids in freshwater are common problems. They accounted for 18% of all diagnostic submissions to the Atlantic Veterinary College from commercial fish hatcheries. Definitive diagnosis is difficult because of the growth characteristics of the ...
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Between 15 November and 13 December 1993, three cases of rabies of probable bat origin were confirmed in red foxes (Vulpes vulpes) from the same area of Prince Edward Island, Canada, previously thought to be free of rabies in terrestrial mammals. Such clusters have rarely been described in North Ame...
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Lysogeny was readily demonstrated among strains of Staphylococcus hyicus that were isolated from chickens. Susceptibility to phage lysis was affected by prophage immunity, but lipase activity and erythromycin resistance were not affected by the presence of temperate phage. In contrast to previously ...
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Juvenile rainbow trout Oncorhynchus mykiss suffering from a mixed gill infection caused by Flavobacterium branchiophilum and Ichthyobodo necatrix [Ichthyobodo necator] were treated with a daily 1-h formalin [formaldehyde] (0.167 mL/L) or chloramine-T (10mg/L) bath on each of three consecutive days. ...
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Bacteriophage typing of Staphylococcus aureus from different outbreaks of tenosynovitis in broiler breeder replacement chickens showed that, although a mixture of phage types was present on affected farms, there was a predominant phage type isolated from lesions of affected chickens. The predominant...
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Oligociliated epithelial cells or cells with a solitary cilium were observed lining hepatic bile ductules in pigs. The cilia were situated in the midst of microvilli, and arose from a basal body that was located in the vicinity of the free surface of the epithelium. The axonemal pattern revealed in ...
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The aim of this investigation was to study in mice the correlation between numbers of phagocytic cells in the bronchoalveolar space and the pulmonary clearance of bacteria. White mice were exposed to aerosols of P. haemolytica or S. aureus in 3 different experimental replicates. Another group of mic...
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Sporocysts of Sarcocystis were recovered from the intestinal mucosa of A. acadicus from Yellowstone National Park, Wyoming, USA. Sporocysts measured 12.0 x 9.7 micro m (9.6-14.0 x 8.0-12.0 micro m; n = 100). Doses of 0, 500, and 2500 sporocysts were administered orally to 5 P. maniculatus and 5 Swis...
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Fischer-344 rats were exposed for 4 hours to 0, 14, 280, or 560 mg of hydrogen sulfide .cntdot. m-3 and killed 1, 18, or 44 hours later. We evaluated the nasal epithelial cells and determined the antaomic distribution of lesions. Inhalation of 560 mg of hydrogen sulfide .cntdot. m-3 induced necrosis...
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Lasalocid and pyrimethamine was administered to American lobsters infected with A. haemophila. Lasalocid was found to be toxic and acute mortality was observed, when administered in vivo in both infected and uninfected lobsters. Pyrimethamine was found very efficient to treat these ciliates at repea...