Journal
EMERGING INFECTIOUS DISEASES
Volume 15, Issue 2, Pages 163-168Publisher
CENTERS DISEASE CONTROL & PREVENTION
DOI: 10.3201/eid1502.071269
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Funding
- Fondo Nacional de Desarrollo Cientifico Technologico [1040875, 1070658]
- Deutscher Akademischer Austausch Diemst.
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Disease outbreaks caused by Vibrio parahaemolyticus in Puerto Montt, Chile, began in 2004 and reached a peak in 2005 at 3,600 clinical cases. Until 2006, every analyzed case was caused by the serovar O3:K6 pandemic strain. In the summer of 2007, only 475 cases were reported; 73% corresponded to the pandemic strain. This decrease was associated with a change in serotype of many pandemic isolates to O3:K59 and the emergence of new clinical strains. One of these strains, associated with 11% of the cases, was genotypically different from the pandemic strain but contained genes that were identical to those found on its pathogenicity island. These findings suggest that pathogenicity-related genes were laterally transferred from the pandemic strain to one of the different V parahaemolyticus groups comprising the diverse and shifting bacterial population in shellfish in this region.
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