| Summary: | 碩士 === 國立臺灣大學 === 獸醫學研究所 === 90 === In order to realize the prevalence of salmonella and campylobacter in ducks in Taiwan, 2000 and 2400 cloacal swabs were collected from 100 duck farms in 15 counties for salmonella and campylobacter isolation from March 2000 to January 2001. The results shown that 4.6% (91/2000) of ducks and 20% (20/100) of the flocks were salmonella positive. S. potsdam and S. dusseldorf were the dominant strains (51.6%) among 10 serovars. Isolation rate of duckling at the age under 15 days were significant higher than other age groups (P < 0.05). Disc diffusion antimicrobial susceptibility test results showed that the salmonella were resistant to Tetracycline (51.6%), Streptomycin (49.4%), Ampicillin (38.5%), Josamicin/Trimethoprim (38.5%), Chloramphenicol (37.4%), and Sulfamethoxazole/Trimethoprim (35.2%), but were 100% susceptible to Norfloxacin, Ofloxacin, Ciprofloxacin, and Ceftriaxone. Results of minimum inhibitory concentration (MIC) test also proved the above findings. For the investigation of campylobacter isolation, prevalence in ducks and flocks were 43.5% (1045/2400) and 92% (92/100). Isolation from the group under age of 15 days were significant lower than other age groups (P < 0.05). Two species were isolated (C. jejuni and C. coli) for all. The results of antimicrobial susceptibility test indicated that over 80% of the campylobacter isolated were resistant to Ampicillin, Amoxicillin, Ceftiofur, Cephalothin, Cephalexin, Flumequine, Kanamycin, Nalidixic acid, Neomycin, Norfloxacin, Ofloxacin, Oxolinic acid, Streptomycin, Sulfamethoxazole/Trimethoprim, and Tetracycline.
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