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Resistance to antimicrobial agents among enterococci isolated from fecal samples of wild marine species in the southern coast of Brazil

Janira Prichula, Rebeca Inhoque Pereira, Guilherme Raffo Wachholz, Leonardo Almansa Cardoso, Neidimar Cezar Correa Tolfo, Naiara Aguiar Santestevan, Aline Weber Medeiros, MaurĂ­cio Tavares, Jeverson Frazzon, Pedro Alves d'Azevedo, Ana Paula Guedes Frazzon
Marine Pollution Bulletin 2016 April 15, 105 (1): 51-7
The purpose of this study was to evaluate species distribution, antimicrobial resistance profiles, and presence of resistance genes in enterococci isolated from fecal samples of wild marine species, including seabirds (n=12), sea turtles (n=8), and mammals (n=3) found alive or dead in southern coast of Brazil. Enterococci were classified based on phenotypic and genotypic characteristics, tested for antibiotic susceptibility, and the presence of tet(S), tet(M), tet(L), mrsC, and erm(B) genes by PCR. Enterococcus faecalis and Enterococcus faecium were the most common species. Single (37.09%), double (25.80%), and multiple (16.12%) antibiotic resistance patterns were observed. Resistance to rifampicin occurred most frequently. The msrC, tet(M), and/or tet(L) genes were detected in 60.15%, 73.07%, and 23.07% of the resistant strains, respectively. In conclusion, the presence of antibiotic resistant strains in these species could be related to food web interactions and aquatic pollutants or linked to environmental resistome.


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