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Florfenicol resistance: Pasteurella multocida

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Cattle

The low rate of resistance development, the low prevalence of transferable resistance determinants among bovine respiratory pathogens, and the limited use of phenicols in human and veterinary medicine explain the continued high degree of florfenicol susceptibility among bovine respiratory isolates.

These bacteria are present in the respiratory tract of healthy animals, where they behave as opportunists in case of immunodeficiency. Clinical symptoms caused by P. multocida include enzootic pneumonia and to a lesser degree fibrinous pneumonia (shipping fever). Both are considered multifactorial syndromes, in which infectious and non-infectious factors are involved.

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