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J Vet Pharmacol Ther. 2019 May;42(3):355-360. doi: 10.1111/jvp.12761. Epub 2019 Mar 25.

Comparative pharmacokinetics of florfenicol in healthy and Pasteurella multocida-infected Gaoyou ducks.

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College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China.
Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China.
Institutes of Agricultural Science and Technology Development, Yangzhou, Jiangsu, China.


Pasteurella multocida is the causative agent of fowl cholera, and florfenicol (FF) has potent antibacterial activity against P. multocida and is widely used in the poultry industry. In this study, we established a P. multocida infection model in ducks and studied the pharmacokinetics of FF in serum and lung tissues after oral administration of 30 mg/kg bodyweight. The maximum concentrations reached (Cmax) were lower in infected ducks (13.88 ± 2.70 μg/ml) vs. healthy control animals (17.86 ± 1.57 μg/ml). In contrast, the mean residence time (MRT: 2.35 ± 0.13 vs. 2.27 ± 0.18 hr) and elimination half-life (T½β : 1.63 ± 0.08 vs. 1.57 ± 0.12 hr) were similar for healthy and diseased animals, respectively. As a result, the area under the concentration curve for 0-12 hr (AUC0-12 hr ) for FF in healthy ducks was significantly greater than that in infected ducks (49.47 ± 5.31 vs. 34.52 ± 8.29 μg hr/ml). The pharmacokinetic differences of FF in lung tissues between the two groups correlated with the serum pharmacokinetic differences. The Cmax and AUC0-12 hr values of lung tissue in healthy ducks were higher than those in diseased ducks. The concentration of FF in lung tissues was approximately 1.2-fold higher than that in serum both in infected and healthy ducks indicating that FF is effective in treating respiratory tract infections in ducks.


Pasteurella multocida ; Pharmacokinetic; ducks; florfenicol; infection

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