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Article

The Role of Aquatic Ecosystems (River Tua, Portugal) as Reservoirs of Multidrug-Resistant Aeromonas spp.

1
CITAB—Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal
2
CIMO—Centro de Investigação de Montanha, ESA-Polytechnic Institute of Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
3
CIIMAR—Interdisciplinary Center for Marine and Environmental Research, Terminal de Cruzeiros de Leixões, 4450-208 Matosinhos, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Caetano C. Dorea
Water 2021, 13(5), 698; https://doi.org/10.3390/w13050698
Received: 14 January 2021 / Revised: 25 February 2021 / Accepted: 28 February 2021 / Published: 5 March 2021
(This article belongs to the Special Issue Freshwater Biophysical Ecosystem Health)
The inappropriate use of antibiotics, one of the causes of the high incidence of antimicrobial-resistant bacteria isolated from aquatic ecosystems, represents a risk for aquatic organisms and the welfare of humans. This study aimed to determine the antimicrobial resistance rates among riverine Aeromonas spp., taken as representative of the autochthonous microbiota, to evaluate the level of antibacterial resistance in the Tua River (Douro basin). The prevalence and degree of antibiotic resistance was examined using motile aeromonads as a potential indicator of antimicrobial susceptibility for the aquatic environment. Water samples were collected from the middle sector of the river, which is most impacted area by several anthropogenic pressures. Water samples were plated on an Aeromonas-selective agar, with and without antibiotics. The activity of 19 antibiotics was studied against 30 isolates of Aeromonas spp. using the standard agar dilution susceptibility test. Antibiotic resistance rates were fosfomycin (FOS) 83.33%, nalidixic acid (NA) 60%, cefotaxime (CTX) 40%, gentamicin (CN) 26.67%, tobramycin (TOB) 26.67%, cotrimoxazole (SXT) 26.67%, chloramphenicol (C) 16.67%, and tetracycline (TE) 13.33%. Some of the nalidixic acid-resistant strains were susceptible to fluoroquinolones. Multiple resistance was also observed (83.33%). The environmental ubiquity, the natural susceptibility to antimicrobials and the zoonotic potential of Aeromonas spp. make them optimal candidates for studying antimicrobial resistance (AMR) in aquatic ecosystems. Aquatic environments may provide an ideal setting for the acquisition and dissemination of antibiotic resistance because anthropogenic activities frequently impact them. The potential risk of multi- and pan-resistant bacteria transmission between animals and humans should be considered in a “One Health—One World” concept. View Full-Text
Keywords: Aeromonas spp.; antibiotic resistance; anthropogenic pressures; river pollution; One Health—One World; multidrug resistance Aeromonas spp.; antibiotic resistance; anthropogenic pressures; river pollution; One Health—One World; multidrug resistance
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MDPI and ACS Style

Gomes, S.; Fernandes, C.; Monteiro, S.; Cabecinha, E.; Teixeira, A.; Varandas, S.; Saavedra, M.J. The Role of Aquatic Ecosystems (River Tua, Portugal) as Reservoirs of Multidrug-Resistant Aeromonas spp. Water 2021, 13, 698. https://doi.org/10.3390/w13050698

AMA Style

Gomes S, Fernandes C, Monteiro S, Cabecinha E, Teixeira A, Varandas S, Saavedra MJ. The Role of Aquatic Ecosystems (River Tua, Portugal) as Reservoirs of Multidrug-Resistant Aeromonas spp. Water. 2021; 13(5):698. https://doi.org/10.3390/w13050698

Chicago/Turabian Style

Gomes, Sónia, Conceição Fernandes, Sandra Monteiro, Edna Cabecinha, Amílcar Teixeira, Simone Varandas, and Maria J. Saavedra. 2021. "The Role of Aquatic Ecosystems (River Tua, Portugal) as Reservoirs of Multidrug-Resistant Aeromonas spp." Water 13, no. 5: 698. https://doi.org/10.3390/w13050698

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