Isolamento de Salmonella resistente a antimicrobianos em duas regiões estuarinas do Estado do Ceará, Brasil

Abstract

Main goal of this study was to isolate and determine the antimicrobial susceptibility of bacteria of the genus Salmonella in 84 water samples from the estuarine environment of Acaraú and Jaguaribe rivers, in Ceará State, both with shrimp farming activities.The strains were tested for susceptibility to ten antibiotics, namely nalidixic acid, ampicillin, ciprofloxacin, ceftriazona, chloramphenicol, gentamicin, imipenem, nitrofurantoin, trimethoprim and tetracycline. The Minimum Inhibitory Concentration in antibiotics was performed following the technique of broth macrodilution. Measurements of pH, temperature and salinity were taken in the field. Out of 103 confirmed Salmonella strains, 90 and 13 were found int Acaraú and Jaguaribe rivers, respectively, belonging to the serovars: S. ser.Newport, S.ser. Saintpaul , S. ser. Panama , S. ser . Rubislaw , S.ser . Albany,S. ser. Anatum S. ser. Corvallis , S. ser.Madelia . Based on these results Acaraú River proved to be more contaminated than Jaguaribe River, with 25% and 75% of strains with plasmidial and chromosomic resistances. These results highlight two problems of public health: the presence of Salmonella strain resistant to antimicrobials and the possibility of human contamination through consumption of shellfish. Moreover, economic losses must be accounted for as derived from market limitations of farmed shrimp overseas due to requirements concerning the exemption of such pathogens in the productive systems.