RESUMO
AIMS: To determine the presence of Vibrio cholerae in different areas of Argentina in three sample types, to determine the composition of planktonic communities in areas at which this pathogen was detected and to characterize the virulence properties and antimicrobial resistance of the recovered environmental isolates. METHODS AND RESULTS: Water and plankton samples were collected in marine, brackish and freshwater environments. Vibrio cholerae non-O1, non-O139 was isolated in 36.1% of the samples analysed. The micro-organism was detected in freshwater but not in marine or brackish samples. No relationship was found between isolation of V. cholerae and presence of any species of plankton. All the isolates presented very similar virulence profiles by PCR, lacking ctxA and tcpA El Tor and containing hlyA (98.7%), rtxA (99.0%), toxR (98.7%) and stn-sto (1.9%). Resistance to ampicillin was found in both Tucumán (21%) and Buenos Aires isolates (45%). CONCLUSIONS: We identified two geographic areas in Argentina where V. cholerae was present: freshwaters of the rivers from Tucumán and the Río de la Plata. SIGNIFICANCE AND IMPACT OF THE STUDY: The identification of V. cholerae strains in the environment, carrying both virulence factors and resistance to antimicrobial agents, highlight the need for a continuous and active surveillance of this pathogen.
Assuntos
Vibrio cholerae/isolamento & purificação , Microbiologia da Água , Argentina , Farmacorresistência Bacteriana , Monitoramento Ambiental/métodos , Água Doce , Testes de Sensibilidade Microbiana , Plâncton/microbiologia , Água do Mar , Vibrio cholerae/genética , Vibrio cholerae/fisiologia , VirulênciaRESUMO
En el presente trabajo se estudió la distribución vertical de la comunidad fitoplanctónica de la zona limnética del embalse, para el período 1992-1993, en relación a la actividad azucarera
