title: Population dynamics and antimicrobial susceptibility of Aeromonas spp. along a salinity gradient in an urban estuary in Northeastern Brazil.
abstract: The main objective of this study was to quantify population and identify culturable species of Aeromonas in sediment and surface water collected along a salinity gradient in an urban estuary in Northeastern Brazil. Thirty sediment samples and 30 water samples were collected from 3 sampling locations (A, B and C) between October 2007 and April 2008. The Aeromonas count was 10-7050CFU/mL (A), 25-38,500CFU/mL (B) and<10CFU/mL (C) for water samples, and ∼100-37,500CFU/g (A), 1200-43,500CFU/g (B) and<10CFU/g (C) for sediment samples. Five species (Aeromonas caviae, A. sobria, A. trota, A. salmonicida and A. allosaccharophila) were identified among 41 isolates. All strains were sensitive to chloramphenicol and ceftriaxone, whereas 33 (80, 4%) strains were resistant to at least 2 of the 9 antibiotics tested. Resistance to erythromycin was mostly plasmidial. In conclusion, due to pollution, the Cocó River is contaminated by pathogenic strains of Aeromonas spp. with a high incidence of antibacterial resistance, posing a serious risk to human health.
authors.affiliation: Federal University of Ceara, Pos-Graduate Program of Engineering of Fish, Av. Mister Hull, s/n, Campus do Pici, Bloco 848, 60021-970 Fortaleza, CE, Brazil. Electronic address: camilapesca@hotmail.com.
authors.forename: Camila Magalhães
authors.initials: CM
authors.lastname: Silva
authors.affiliation: Federal University of Reconcavo Baiano CCAAB - Center for Research on Fisheries and Aquaculture (NEPA), Campus Universitário, 44380-000 Cruz das Almas, BA, Brazil.
authors.forename: Norma Suely
authors.initials: NS
authors.lastname: Evangelista-Barreto
authors.affiliation: Institute of Marine Science, Av. da Abolição, 3207, Meireles, 60165-081 Fortaleza, CE, Brazil.
authors.forename: Regine Helena Silva Dos Fernandes
authors.initials: RHSDF
authors.lastname: Vieira
authors.affiliation: Institute of Marine Science, Av. da Abolição, 3207, Meireles, 60165-081 Fortaleza, CE, Brazil.
authors.forename: Kamila Vieira
authors.initials: KV
authors.lastname: Mendonça
authors.affiliation: Institute of Marine Science, Av. da Abolição, 3207, Meireles, 60165-081 Fortaleza, CE, Brazil.
authors.forename: Oscarina Viana de
authors.initials: OV
authors.lastname: Sousa
mesh_terms: D000333:Aeromonas / Q000145:classification / Q000187:drug effects* / Q000302:isolation & purification; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001938:Brazil; D002443:Ceftriaxone / Q000494:pharmacology; D002701:Chloramphenicol / Q000494:pharmacology; D024881:Drug Resistance, Bacterial; D004917:Erythromycin / Q000494:pharmacology; D063366:Estuaries; D019015:Geologic Sediments / Q000382:microbiology*; D006801:Humans; D008826:Microbial Sensitivity Tests; D054712:Salinity
chemical_list: D000900:Anti-Bacterial Agents; D004917:Erythromycin; D002701:Chloramphenicol; D002443:Ceftriaxone
keywords: Aeromonas; Aquatic environments; Health risks; Physicochemical parameters; Plasmid curing; Resistance