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Detection and characterisation of potentially pathogenic species of Vibrio in the Vibrata river, Abruzzo Region, Italy.
Veterinaria Italiana 2018 June 31
This study aimed to isolate, define the genetic profile, assess potential pathogenicity and evaluate the seasonal distribution of Vibrio cholerae, Vibrio parahaemolyticus, and Vibrio vulnificus strains isolated from the Vibrata river (Abruzzo Region, Italy) during a monitoring period of one year. Detection was performed according to ISO/TS 21872-1-2:2007. Species identification and characterisation were achieved using molecular methods. Vibrio spp. were detected in 50% (23) of the water samples. In particular, V. cholerae, V. parahaemolyticus, and V. vulnificus were isolated in 18 (39.1%), 4 (8.7%), and 2 (4.3%) samples, respectively. All V. parahaemolyticus strains were tdh gene negative, 75% were positive for trh gene. In 30 V. cholerae isolates, the polymerase chain reaction (PCR) assay for detecting virulence and regulatory genes (ctxA, toxR, tcpA, ompU, hlyA, tcpI, zot, and stn/sto) revealed 6 genotypes associated to different levels of pathogenicity. Pulsed-field gel electrophoresis (PFGE) characterisation of the V. cholerae strains identified 13 different pulsotypes. A greater degree of similarity was shown for strains isolated in the same period of the year. Results of our study reveal a potential health risk associated with the waters of the Vibrata river, which are used for irrigation and next to the swimming areas of Abruzzo coastline.
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