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Journal of Clinical Microbiology, April 1998, p. 971-974, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Epidemiological Analysis of Salmonella enteritidis Isolates from Humans and Broiler Chickens in Thailand by Phage Typing and Pulsed-Field Gel Electrophoresis

Sumalee Boonmar,1,* Aroon Bangtrakulnonth,2 Srirat Pornrunangwong,2 Jun Terajima,3 Haruo Watanabe,3 Ken-Ichi Kaneko,4 and Masuo Ogawa4

Faculty of Veterinary Medicine, Kasetsart University, Bangkhen, Bangcock 10903,1 and WHO International Salmonella & Shigella Center, National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Bangkok 10900,2 Thailand, and Department of Bacteriology, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo 162,3 and Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo 183,4 Japan

Received 28 August 1997/Returned for modification 11 November 1997/Accepted 23 December 1997

To determine the phage types (PT) of Salmonella enteritidis found in Thailand and to clarify the potential for human infection by S. enteritidis in broiler chicken meat, human and poultry isolates taken from Thailand between 1990 and 1997 were phage typed and analyzed by pulsed-field gel electrophoresis (PFGE). Ten different PT were found among the 302 isolates phage typed, with PT 4 being the most frequent in human (73.9%) and poultry (76.2%) isolates, followed by PT 1 (8.0%), 8 (3.6%), and 7a (2.2%) in human isolates and by PT 7a (4.9%), 1 (3.7%), and 12 (2.4%) in poultry isolates. Of the 53 isolates analyzed by PFGE, 45 showed an indistinguishable pattern (pattern A) by BlnI-digested PFGE and the other 8 isolates showed a very similar pattern that differed by only a few bands. These results indicate the spread of a genetically identical clone of S. enteritidis in humans and poultry in Thailand.

* Corresponding author. Faculty of Veterinary Medicine, Kasetsart University, Bangkhen, Bangcock 10903, Thailand. Phone: 66-2-579-7541. Fax: 66-2-561-1591. E-mail: fvetslb{at}ku.ac.th.

Journal of Clinical Microbiology, April 1998, p. 971-974, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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