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Microbiology and Molecular Biology Reviews, December 1998, p. 1301-1314, Vol. 62, No. 4
1092-2172/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Epidemiology, Genetics, and Ecology of Toxigenic
Vibrio cholerae
Shah M.
Faruque,1,*
M. John
Albert, and
John J.
Mekalanos2
Molecular Genetics Laboratory, International
Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka-1000,
Bangladesh,1 and
Department of
Microbiology and Molecular Genetics, Harvard Medical School,
Boston, Massachusetts 021152
Cholera caused by toxigenic Vibrio cholerae is a major public health problem confronting developing countries, where outbreaks occur in a regular seasonal pattern and are particularly associated with poverty and poor sanitation. The disease is characterized by a devastating watery diarrhea which leads to rapid dehydration, and death occurs in 50 to 70% of untreated patients. Cholera is a waterborne disease, and the importance of water ecology is suggested by the close association of V. cholerae with surface water and the population interacting with the water. Cholera toxin (CT), which is responsible for the profuse diarrhea, is encoded by a lysogenic bacteriophage designated CTX
. Although the mechanism by which CT causes diarrhea is known, it is not clear why V. cholerae should infect and elaborate the lethal toxin in the host. Molecular epidemiological surveillance has revealed clonal diversity among toxigenic V. cholerae strains and a continual emergence of new epidemic clones. In view of lysogenic conversion by CTX
as a possible mechanism of origination of new toxigenic clones of V. cholerae, it appears that the continual emergence of new toxigenic strains and their selective enrichment during cholera outbreaks constitute an essential component of the natural ecosystem for the evolution of epidemic V. cholerae strains and genetic elements that mediate the transfer of virulence genes. The ecosystem comprising V. cholerae, CTX
, the aquatic environment, and the mammalian host offers an understanding of the complex relationship between pathogenesis and the natural selection of a pathogen.
*
Corresponding author. Mailing address: Molecular
Genetics Laboratory, Laboratory Sciences Division, ICDDR,B, GPO Box
128, Dhaka-1000, Bangladesh. Phone: 880 2 871751 to -60. Fax: 880 2 872529 and 880 2 883116. E-mail: faruque{at}icddrb.org.
Microbiology and Molecular Biology Reviews, December 1998, p. 1301-1314, Vol. 62, No. 4
1092-2172/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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