4 research outputs found
Interactions between polychlorinated biphenyls (PCBs) and soil microfungi. Effects of Aroclor-1254 and other PCBs onAspergillus flavus cultures
Agentes bacterianos enteropatogĂȘnicos em suĂnos de diferentes faixas etĂĄrias e perfil de resistĂȘncia a antimicrobianos de cepas de Escherichia coli e Salmonella spp Enteropathogenic bacterial agents in pigs of different age groups and profile of resistance in strains of Escherichia coli and Salmonella spp. to antimicrobial agents
As enterites infecciosas bacterianas provocam severas perdas para a indĂșstria suĂna em todo o mundo. Os objetivos deste trabalho foram determinar os agentes bacterianos, associados com a ocorrĂȘncia de diarrĂ©ia em suĂnos, em diferentes faixas etĂĄrias, no Estado de Santa Catarina, Brasil, e verificar o perfil de resistĂȘncia das cepas de Escherichia coli e Salmonella spp, frente aos principais antimicrobianos utilizados em granjas de suĂnos. Os principais gĂȘneros/espĂ©cies bacterianos diagnosticados foram Escherichia coli, Clostridium spp, Salmonella spp Brachyspira hyodysenteriae, Brachyspira pilosicoli e Lawsonia intracellularis. Os fatores de virulĂȘncia de E. coli mais prevalentes na fase de maternidade foram F5 / (K99) 20%, F6 / (987P) 16,3%, F42 6,8% e F41 5,7%, jĂĄ nas fases de creche e terminação, predominaram cepas com fimbrias F4 (K88) 11,2% e 5,4%, respectivamente. Para E. coli os maiores Ăndices de resistĂȘncia foram encontrados para oxitetraciclina (94%) e tetraciclina (89,5%) e os menores Ăndices de resistĂȘncia para neomicina (55%), ceftiofur (57,4%). Quanto Ă s amostras de Salmonella spp, estas apresentaram maior resistĂȘncia Ă oxitetraciclina (77%), e Ă tetraciclina (42,1%) e menor Ă gentamicina (3,5%) e amoxicilina (4,8%).<br>Infectious bacterial enteritis causes severe losses to the swine industry worldwide. The objective of this study was to determine the epidemiology of bacterial agents that are associated with the occurrence of diarrhea in pigs at different age groups, and to verify the profile of resistance of strains of Escherichia coli and Salmonella spp to the main antimicrobial agents. The main bacterial species diagnosed were Escherichia coli, Clostridium spp, Salmonella spp, Brachyspira hyodysenteriae, Brachyspira pilosicoli and Lawsonia intracellularis. The E. coli virulence factors of higher prevalence in preweaning piglets were F5 / (K99) 20%, F6 / (987P) 16.3%, F42 6.8% and F41 5.7%, whereas at the nursery and with finishing pigs, the prevalent strain was the fimbria F4 (K88) 11.2% e 5.4%, respectively. E. coli and Salmonella spp were highly resistant to oxytetracycline (94%) and tetracycline (90%), with the former having a low resistance to neomycin (55%) and ceftiofur (57%), and the latter to gentamicin (3.5%) and amoxicillin (4.8%)