Biofilm production by Escherichia coli in poultry water drinkers
Palavras-chave:Água, avicultura, comunidades microbianas, desinfecção.
This study evaluated the microbiological quality of the water of 33 poultry sheds seeking to identify the presence of biofilm-producing Escherichia coli. The swab samples of the surface of the drinkers were analyzed by the inhibition test to detect the most effective disinfectant for removing these bacterial communities. The multiple-tube and mesophilic counts techniques were used to analyze the water samples. The swabs were plated on EMB agar followed by Rugai medium to identify E. coli. The biofilm was detected by the optical density readings and the Congo red agar method. Overall, 15 strains of Escherichia coli were detected in the swabs of the drinkers, of which 8 were biofilm producers. Regarding the water quality, 15 (45.45%) of the 33 evaluated water samples had bacterial growth while only two (13.33%) produced gas. The test with disinfectants showed that chlorine and chlorhexidine were not effective to control the E. coli biofilm production. Therefore, a strict control is essential to ensure the safety of the water supplied to the animals in broiler sheds and to eliminate the biofilm-forming E. coli that have shown to be potentially resistant to the sanitizers commonly used in the cleaning processes.