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- W2012158124 abstract "Mycoplasma hyopneumoniae is the etiological agent of swine enzootic pneumonia, a chronic nonfatal disease affecting pigs of all ages. To obtain better insight in the mechanisms responsible for differences in virulence between highly and low virulent M. hyopneumoniae isolates, 23 caesarean-derived, colostrum-deprived piglets were randomly assigned to three groups. Groups 1 and 2 consisted of nine animals each, which were intratracheally inoculated at 1 week of age with a highly or a low virulent isolate of M. hyopneumoniae, respectively. The remaining five animals were inoculated with sterile culture medium. Animals were euthanized at 5, 10, 15 and 28 days post-inoculation (DPI). Animals inoculated with the highly virulent isolate had more neutrophils in BAL fluid at 10, 15 and 28 DPI compared to the other groups. At 10 and 15 DPI, animals in the highly virulent group had significantly higher concentrations of TNF-α in BAL fluid. IL-1β concentration in this group was higher at 5 and 28 DPI compared to the other groups. From 10 DPI onwards, significantly higher titres of M. hyopneumoniae were detected in the BAL fluid of animals inoculated with the highly virulent isolate compared to animals inoculated with the low virulent isolate. Additionally, the in vitro generation time of the highly virulent M. hyopneumoniae isolate was significantly shorter than that of the low virulent isolate. The present study indicates that the difference in pathogenicity between the highly and low virulent isolates is associated with a faster in vitro growth, a higher capacity to multiply in the lungs and the induction of a more severe inflammation process by the highly virulent isolate." @default.
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- W2012158124 date "2007-02-01" @default.
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- W2012158124 title "Interactions of highly and low virulent Mycoplasma hyopneumoniae isolates with the respiratory tract of pigs" @default.
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- W2012158124 doi "https://doi.org/10.1016/j.vetmic.2006.10.010" @default.
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