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Journal of Clinical Microbiology, November 2003, p. 5053-5058, Vol. 41, No. 11
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.11.5053-5058.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Temporal Shifts in the Dominance of Serotypes of Shigella dysenteriae from 1999 to 2002 in Dhaka, Bangladesh

Kaisar A. Talukder,* M. Aminul Islam, Bijay K. Khajanchi, Dilip K. Dutta, Zhahirul Islam, Ashrafus Safa, Khorshed Alam, A. Hossain, G. B. Nair, and David A. Sack

ICDDR, B: Centre for Health and Population Research, Dhaka 1000, Bangladesh

Received 28 April 2003/ Returned for modification 3 July 2003/ Accepted 12 August 2003

A total of 358 Shigella dysenteriae strains isolated from patients attending the Dhaka treatment center of the International Centre for Diarrheal Disease Research, Bangladesh, between the years 1999 and 2002 were included in this study. S. dysenteriae type 1, the dominant serotype in 1999 (76.4%), declined to 6.5% in 2002. On the other hand, S. dysenteriae types 2 to 12 were isolated with increasing frequencies of 19, 67, 73.5, and 87% in 1999, 2000, 2001, and 2002, respectively. Of these, types 2 and 4 were the most dominant serotypes, accounting for more than 18.7 and 28.5% of the total isolates, respectively. There was no isolation of serotypes 5, 7, 8, and 13 during this period. Twenty-eight (7.8%) of the isolates were atypical and agglutinated only with the polyvalent antiserum of S. dysenteriae. More than 98% of type 1 strains isolated between 1999 and 2001 were resistant to ampicillin, sulfamethoxazole-trimethoprim, and nalidixic acid. Among other serotypes of S. dysenteriae, Nalr type 2 strains were isolated in 2001 and 2002. Although heterogeneous plasmid profiles were obtained depending on the presence or absence of a single plasmid, core plasmids were defined for particular serotypes. On the other hand, the same plasmid profile was found to be shared by different serotypes. Interestingly, plasmid patterns of types 2 and 4 were almost identical except that a middle-range plasmid of 70 to 60 MDa was present in type 4 in addition to the core plasmids. All the strains harboring the 140-MDa plasmid were positive for the ipaH gene, had Congo red binding abilities, and were positive by the Sereny test, demonstrating their invasive properties.

* Corresponding author. Mailing address: Enteric Bacteriology Laboratory, Laboratory Sciences Division, ICDDR, B: Centre for Health and Population Research, GPO Box 128, Dhaka 1000, Bangladesh. Phone: 880 2 8811751-60. Fax: 880 2 8812529. E-mail: kaisar{at}icddrb.org.

Journal of Clinical Microbiology, November 2003, p. 5053-5058, Vol. 41, No. 11
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.11.5053-5058.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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