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Advisor(s)
Abstract(s)
Freshwater unionoids are one of the most threatened animal groups worldwide, suffering dramatic
regressions globally. The freshwater pearl mussel Margaritifera margaritifera, currently listed as critically
endangered in Europe, and Potomida littoralis, listed as endangered, are both present in the River Tua basin
(Portugal). The inappropriate use of antibiotics has led to the emergence and spread of resistant bacteria,
recognized today as a serious public health problem. Based in the concept of “One health”, the objective of
this study was to examine the antibacterial resistance rates in Escherichia coli and other Enterobacteriaceae
isolates obtained from both bivalves collected in the River Tua Basin during the summer of 2018. Activity of
22 antibiotics was studied using disc diffusion (Kirby–Bauer) method. Multidrug resistant in E. coli and
Enterobacteriaceae isolates was observed only from P. littoralis. Overall, results show that M. margaritifera
inhabits more pristine sectors of river not subject to the development of multidrug resistance, unlike P.
littoralis which, although does not tolerate high levels of contamination, is naturally found in lower stretches
is subject to greater pressure and, as such, a greater probability of the appearance of multi-resistant
organisms. The presence of E. coli in freshwater bivalves can represents serious public health problems once
bacteria are one the most important biological contaminants in foodborne diseases. Given the conservation
status of both studied species their protection against this silent/invisible enemy should be a priority,
although work done with UnionidMussels fromNorthern Portugal showed that they had a great antimicrobial
and antibiofilm activity.
Description
Keywords
E. coli
Citation
Saavedra, Maria José; Fernandes, Conceição; Ballem, Andressa; Varandas, Simone (2021). Endangered mussels as antimicrobial-resistant E. coli and other species (Enterobacteriaceae family) reservoirs. In SEFS12- Symposium for European Freshwater Sciences: Book of abstracts. Online
Publisher
Irish Freshwater Sciences Association