Z-016. Investigation of Salmonella Infection in Household and Stray Dogs of Central Taiwan

T-H. Chen1, Y-C. Chang2,3, C-W. Liao1, Y-C. Wang3;
1The Graduate Inst. of Vet. Pub. Hlth., Natl. Chung Hsing Univ., Taichung, TAIWAN, 2China Med. Univ., Taichung, TAIWAN, 3Natl. Chung Hsing Univ., Taichung, TAIWAN.

Background: Salmonella infection is an most important zoonosis worldwide by contamination of food. However, the salmonellae infect to human that the chance of other sources in the environment. In recent years, the dog which are closely related with human living and the Salmonella were isolated form dog in Taiwan previously. The aim of this study is to investigate the current status of the Salmonella infection in household and stray dogs in central Taiwan. Methods: Samples were taken during the period November 2005 to March 2007. Rectal swabs from stray dogs were collected at five municipal animal shelters located in central Taiwan. For the household dogs, swabs were collected form veterinary establishments in Taichung city and county. Antimicrobial sensitivity screening was performed with the disc diffusion assay according to the Clinical and Laboratory Standards Institute/National Committee for Clinical Laboratory Standards for the following antimicrobial agents: ampicillin, ceftiofur, ceftriaxone, chloramphenicol, ciprofloxacin, enrofloxacin, gentamicin, nalidixic acid, flofenicol, trimethoprim-sulfamethoxazole, and tetracycline. Results: Of total of 1109 dogs sampled, 168 Salmonella spp. were isolated, 15.98%(160/1001) of stray dogs and 7.14%(8/108) of household dogs were positive for salmonella. The most frequently isolated serotypes were S. Newport(16.67%), S. Enteritids (10.30%), and S. Senftenberg (4.17%). 99.41% (167/168) were resistant to one or more antimicrobial agents. Regardless of source, antimicrobial resistance was highest to Colistin(98.81%), secondly was 28.57% of Tetracycline, and 27.98% of Nalidixic acid. The result of questionnaire survey with veterinary hospital in central Taiwan, Cephalexin(18.5%), Enrofloxacin(14%), Gentamicin(13.8%), Tetracycline(8.3%) and Ampicillin(8.3%) was used usually in veterinary clinics. Conclusion: Our study show that stray dogs had higher Salmonella positive rate than household dogs, and they would be a potentially source of human or animal salmonellosis. Further investigation would be needed to clarify the epidemiological and public health relationship.