Swine Dysentery
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Ocorrência e identificação de espiroquetas intestinais em suínos em granjas de porte industrial de duas regiões criatórias do Estado do Rio Grande do Sul, em relação da medicação da ração. / Ocurrence and identification of swine intestinal spirochetes in industrial pig herds from two raising areas in the state of Rio Grande do Ssul, Brazil, in relation to feed medication
As infecções intestinais por espiroquetas em suínos, na fase que se segue ao alojamento nos prédios de recria, são predispostas por fatores como o estresse da movimentação, mistura entre animais imunes e excretores com leitões não imunes, deficiências nas condições ambientais e troca no tipo da ração usada. Para contrabalançar esses efeitos, �
Publicado em: 2010
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2. Serotype-Specific Protection Against Treponema hyodysenteriae Infection in Ligated Colonic Loops of Pigs Recovered from Swine Dysentery
Resistance to Treponema hyodysenteriae (serotypes 1, 2, 3, and 4) infection was evaluated in ligated colonic loops in pigs recovered from swine dysentery. Lesions were present in most loops from recovered swine inoculated with heterologous serotypes; however, lesions were not present in loops of recovered swine inoculated with homologous serotypes.
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3. Comparison of stained smears and culturing for identification of Treponema hyodysenteriae.
A comparative study was made of stained fecal smears and cultured fecal swabs for identification of the large spirochetes Treponema hyodysenteriae and Treponema innocens. Feces were obtained by swabbing rectums, colons, and stools of nonexposed swine and swine experimentally exposed to swine dysentery. In this study there was a significant (P less than 0.001
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4. Experimental infection of rabbit ligated ileal loops with Treponema hyodysenteriae.
An in vivo animal model was used to assess the enteropathogenicity of the etiological agent (Treponema hyodysenteriae) of swine dysentery. Multiple ligated ileal loops, prepared in New Zealand white rabbits, were challenged with either pathogenic (B78 and B204) or nonpathogenic (Pu) isolates of the organism. The pathogenic isolates induced the onset of intes
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5. Localization of Spirochetes with the Structural Characteristics of Treponema hyodysenteriae in the Lesions of Swine Dysentery
The large intestines of pigs with swine dysentery were examined by phase, light, and electron microscopy at intervals up to 11 days after oral inoculation with mucosal scrapings from infected pigs. Large spirochetes with the structural characteristics of Treponema hyodysenteriae were found only in infected pigs and were first observed in small numbers in the
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6. Characterization of two DNA probes specific for Serpulina hyodysenteriae.
Two DNA probes, one 1.1- and one 0.75-kb probe, specific for Serpulina hyodysenteriae were isolated from a genomic library generated from virulent S. hyodysenteriae 5380. These probes are highly specific and react with all S. hyodysenteriae strains tested. Under stringent conditions, the DNA probes did not react with the nonpathogenic species Serpulina innoc
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7. Selective medium for isolation of Treponema hyodysenteriae.
Pure cultures of six pathogenic isolates of Treponema hyodysenteriae, the colonic mucosal scrapings of seven pigs with acute swine dysentery, and feces from seven unaffected pigs were diluted in phosphate-buffered saline and plated on Trypticase soy agar with 5% citrated bovine blood (TSA) and TSA with various levels of spectinomycin (TSA-S). The plates were
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8. Experimental infection with Treponema hyodysenteriae in guinea pigs.
Outbred and inbred (Hartley strain) guinea pigs (GP) were inoculated intragastrically with pathogenic and nonpathogenic Treponema hyodysenteriae. GP 3 to 16 weeks old received T. hyodysenteriae after a fasting period of 36 to 72 h. Infected GP with pathogenic T. hyodysenteriae developed a diarrheal and/or depressive condition, with mucus but not blood in the
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9. Enteropathogenicity of various isolates of Treponema hyodysenteriae.
Isolates of Treponema hyodysenteriae from 25 geographically separated outbreaks of swine dysentery were tested for their ability to produce the disease. Clinical signs and lesions typical of acute swine dysentery were produced in 52 of 68 (75%) susceptible specific pathogen-free pigs that had been orally inoculated with pure cultures of 23 of 25 beta-hemolyt
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10. Pathogenic synergism between Treponema hyodysenteriae and other selected anaerobes in gnotobiotic pigs.
Gnotobiotic pigs were orally exposed to various anaerobes at 6 to 9 days of age and similarly inoculated with Treponema hyodysenteriae B204 3 to 6 days later. Watery diarrhea and fecal excretion of large quantities of mucus and some fibrin clots were observed 4 to 20 days after inoculation with B204 if other anaerobes were present. Colonic lesions characteri
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11. Isolation of Treponema hyodysenteriae from wild rodents.
Rodents from swine-producing farms were examined for the presence of Treponema hyodysenteriae. Wild mice (n = 257) and rats (n = 41) were trapped on eight farms. Ceca were removed aseptically, and the contents and mucosal scrapings were cultured on selective medium (blood agar containing 400 micrograms of spectinomycin per ml). T. hyodysenteriae was detected
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12. Production of lesions in gnotobiotic mice by inoculation with Treponema hyodysenteriae.
Treponema hyodysenteriae was established in the ceca of gnotobiotic mice in the absence of other organisms. Superficial mucosal lesions characteristic of swine dysentery were present in the ceca of mice inoculated with T. hyodysenteriae in combination with viable Bacteroides vulgatus. Deep crypt necrosis was detected in the ceca of mice inoculated with T. hy