Genotypic and phenotypic differentiation of Salmonella enterica serovar Paratyphi B in Malaysia

Thong, K.L.; Ang, C.P. (2011) Genotypic and phenotypic differentiation of Salmonella enterica serovar Paratyphi B in Malaysia. Southeast Asian Journal of Tropical Medicine and Public Health, 45 (2). ISSN 0125-1562

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Abstract. Salmonella enterica serovar Paratyphi B is known to cause either paratyphoid fever or gastroenteritis. Differentiation of Salmonella ser. Paratyphi B into biotype Java (d-tartrate fermenting, dT+) and biotype Paratyphi B (d-tartrate non-fermenting, dT) is important for Salmonella epidemiology. This study applied a PCR approach to differentiate the two biotypes to augment the conventional biochemical method and to determine the antibiograms and genomic diversity of Malaysian S. Paratyphi B. Among 100 strains tested (clinical, 86; non-humans, 14), only two clinical strains were confirmed as biotype Paratyphi B as indicated by both lead acetate test and PCR. Antibiotic resistance rates were as follows: streptomycin 18%, sulphonamides 13%, ampicillin 10%, chloramphenicol 4%, tetracycline 3%, cefotaxime 2%, cefpodoxime 2%, ceftazidime 2%, gentamicin 1% and trimethoprim 1%. None showed resistance towards amoxicillin-clavulanic acid, ceftiofur, ciprofloxacin, nalidixic acid and trimethoprim-sulphamethoxazole. Seven strains showed multidrug resistance towards 3 or more classes of antimicrobial agents. REP-PCR and PFGE generated 32 and 76 different profiles, respectively. PFGE (D = 0.99) was more discriminative than REP-PCR (D = 0.93) and antimicrobial susceptibility test (D = 0.48) in subtyping the strains. Strains isolated 18 years apart (1982 - 2008) from different localities in Malaysia were clonally related as demonstrated by REP-PCR and PFGE, indicating that these strains were stable and widely distributed. In some clusters, strains isolated from different sources (clinical, food and animal) were grouped together. Thus, biotype Java was the most common biotype of Salmonella ser. Paratyphi B in Malaysia. The PCR approach is highly recommended due to its simplicity, specificity and ease of operation. The level of antimicrobial resistance among Salmonella ser. Paratyphi B remained relatively low in Malaysia but the emergence of resistance to cephalosporins is a cause for concern.

Item Type: Article
  1. Thong, K.L.(Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, MALAYSIA)
  2. Ang, C.P.
Journal or Publication Title: Southeast Asian Journal of Tropical Medicine and Public Health
Additional Information: Microbiology Division, Institute of Biological Science, University of Malaya, Kuala Lumpur, Malaysia.
Uncontrolled Keywords: Biological Science
Subjects: Q Science > Q Science (General)
R Medicine
Depositing User: Mr. Faizal Hamzah
Date Deposited: 25 Feb 2012 10:38
Last Modified: 14 Dec 2017 14:00

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