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Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species
09:34

Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species

Published on: November 8, 2016

Vibrio parahaemolyticus serovar O3:K6 gastroenteritis in northeast Brazil

N C Leal1, S C da Silva, V O Cavalcanti

  • 1Centro de Pesquisas Aggeu Magalhães/Fiocruz, Cidade Universitária, Pernambuco, Brasil. nilma.leal@pq.cnpq.br

Journal of Applied Microbiology
|March 18, 2008
PubMed
Abstract

Insights

The pandemic clone of Vibrio parahaemolyticus is widespread in Brazil, making outbreak tracking difficult due to genetic uniformity. This highlights the need for routine monitoring of diarrheal diseases.

Area of Science:

  • Microbiology
  • Genetics
  • Epidemiology

Background:

  • Vibrio parahaemolyticus is a significant cause of diarrheal illness.
  • Serogroup O3 strains are associated with pandemic outbreaks.
  • Understanding the genetic diversity and virulence factors of V. parahaemolyticus is crucial for public health.

Purpose of the Study:

  • To investigate the virulence factors and genetic relationships of Vibrio parahaemolyticus serogroup O3 isolates.
  • To analyze strains from diarrheal outbreaks in Northeast Brazil.

Main Methods:

  • Multiplex polymerase chain reaction (m-PCR) for virulence genes (tl, tdh, trh).
  • Random-amplified polymorphic DNA (RAPD) analysis.
  • 16S-23S rDNA region amplification.

Main Results:

  • The tl gene was present in all isolates, while tdh was found in 16 out of 18.
  • The trh gene was not detected in any isolate.
  • rDNA 16S-23S amplification yielded a single profile, indicating genetic uniformity.
  • RAPD analysis grouped isolates, identifying two tdh-negative, Kanagawa-negative strains.

Conclusions:

  • Vibrio parahaemolyticus strains resembling the pandemic clone are prevalent in Northeast Brazil.
  • The genetic uniformity of these isolates limits the effectiveness of current molecular techniques for outbreak investigation and source tracking.
  • Routine inclusion of V. parahaemolyticus in diarrheal disease monitoring is recommended for etiological clarification.

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