Variation of pH, salinity and temperature for the establishment of Vibrio cholerae in the city of Rio de Janeiro (Brazil)

• Autor(a) principal: Silva, Everaldo de Santana
• Data de Publicação: 2019
• Outros Autores: Fernandez, Marcos Antonio dos Santos, Lopes, Amanda Pontes, Costa, Bárbara Silva, Pereira, Sidharta Soares, Pereira, Matheus Ventura
• Tipo de documento: Artigo
• Idioma: por; eng
• Título da fonte: Vigilância Sanitária em Debate
• Texto Completo: https://visaemdebate.incqs.fiocruz.br/index.php/visaemdebate/article/view/1154
• topic: Invasive Species; Port Water; Vibrio cholerae; Ballast Water; Espécie Invasora; Água portuária; Vibrio cholerae; Água de Lastro.

Introduction: The toxigenic Vibrio cholerae, which causes Cholera, have a defined environmental tolerance regarding pH, temperature and salinity which does not prevent it from entering viable-but-nonculturable (VBNC) state, when the ranges of these parameters are not favorable. Port areas are vulnerable places for pathogen introduction, due to the contribution of urban effluents and the disposal of ballast water. Objective: The work evaluated whether the port of Rio de Janeiro present pH, salinity and temperature conditions that allow the microorganism establishment. Method: Twenty-two monitoring campaigns were carried out in 9 points, from March 2017 to February 2018, always searching for different climatic and tidal conditions. Results: The tide had a slight influence on the salinity, while the climate interacted with all the factors. The temperature and pH remained within the optimal range for the pathogen establishment, while the salinity was outside the ideal range most of the times. Conclusions: Analyzing only these factors, we can suggest that, if these standards are maintained, the region could present a risk of the microorganism survival.