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  • Title: Salmonella enteritidis outbreak in Thailand: study by random amplified polymorphic DNA (RAPD) analysis.
    Author: Kantama L, Jayanetra P.
    Journal: Southeast Asian J Trop Med Public Health; 1996 Mar; 27(1):119-25. PubMed ID: 9031413.
    Abstract:
    An outbreak of Salmonella enteritidis in Thailand was reported in 1990. The majority of isolates were found in chicken and human throughout the country. The continuation of a high rate of spreading which is presently continuing prompted us to investigate possible clonal involvement in the outbreak. One hundred and twenty five isolates of S. enteritidis which were isolated between 1990-1993 were clonally identified by the technique of Random Amplified Polymorphic DNA (RAPD) analysis. Eight profiles were found indicating the presence of 8 clones, designated no. 1-8. The predominant clone was profile no. 4 which was encountered in 93.6% of tested isolates while the rest of the profile comprised only 0.8-1.6%. The predominant clone was distributed mainly in isolates from chickens and humans which is suggestive that the profile no. 4 is the major clone involved in this outbreak and that chickens were the source of S. enteritidis infection. The information from the Microbiology Laboratory at Ramathibodi Hospital revealed that nearly 40% of S. enteritidis were isolated from blood specimens. This may reflect the invasiveness of S. enteritidis in Thailand. We concluded that the outbreak involved the single clone, RAPD profile no. 4 which may disperse dominantly during the epidemic.
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