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Area of Science:

  • Microbiology
  • Epidemiology
  • Public Health

Background:

  • Cholera is a severe diarrheal disease caused by toxigenic Vibrio cholerae O1 strains.
  • Seven cholera pandemics have occurred in the last 200 years, with contaminated water and food as primary transmission routes.
  • Increased international food trade raises concerns about the global spread of cholera.

Purpose of the Study:

  • To investigate the role of food, specifically seafood, in the transmission of Vibrio cholerae during the recent Latin American epidemic.
  • To document domestically acquired cholera cases in the United States linked to environmental reservoirs and imported food.
  • To utilize molecular typing for identifying and characterizing Vibrio cholerae strains and their transmission pathways.

Main Methods:

  • Epidemiological investigation of cholera cases linked to international travel and seafood consumption.
  • Analysis of domestically acquired cholera cases in the U.S. since 1973.
  • Application of molecular typing techniques to characterize Vibrio cholerae strains and trace transmission routes.

Main Results:

  • Inadequately cooked seafood was implicated as a source of cholera during the Latin American epidemic.
  • Over 100 cholera cases in the U.S. were linked to seafood consumed in Latin America or transported noncommercially.
  • Vibrio cholerae persists in environmental reservoirs in Australia and the U.S. Gulf Coast, with 65 domestically acquired cases since 1973.
  • Molecular typing confirmed food as a vehicle of transmission in epidemiologically identified outbreaks.

Conclusions:

  • Contaminated food, especially seafood, poses a significant risk for cholera transmission, even with regulated international trade.
  • Environmental reservoirs of Vibrio cholerae contribute to domestically acquired cases in regions like the U.S. Gulf Coast.
  • Molecular typing is crucial for understanding cholera epidemiology, strain characterization, and documenting transmission events.