Detecção de micro-organismos, resíduos de antimicrobianos e células somáticas provenientes de laticínios da microrregião de Imperatriz, Maranhã

Abstract

This study aimed to assess the quality of refrigerated raw milk from dairies inspected the Microregion of Imperatriz (municipalities of Imperatriz, Senator La Roque and Porto Franco), researching the contamination indicator CBT and CCS, microrganisms Staphylococcus sp. and Escherichia coli, detect antimicrobial residues and examine the profile of microbial sensitivity to the antimicrobials. The quantification and the determination of micro-organisms for microbiological and biochemical methods. The disc diffusion method for the assessment of antimicrobial susceptibility in 18 strains of Coagulasis-positive Staphylococcus, 22 strains of Staphylococcus and Escherichia coli isolated from milk samples. Residues of antibiotics through trading kits were surveyed. The somatic cell count of dairy products showed averages of 394.340 CS/mL and it accord with current legislation. On the microbiological quality, the CBT with rates above the permitted, high frequency of contamination by bacteria of Coagulasis-positive Staphylococcus in 26 (52%) samples of milk, being 19 (38%) samples infected by Staphylococcus aureus was detected. The antimicrobial residues in 38 (76%) samples for the two kits used, were detected. Strains of Coagulasis-positive Staphylococcus, Staphylococcus aureus and E. coli showed up multiresistant, with the most effective antimicrobials for E. coli was cotrimoxazole, ampicillin, amoxicillin and enrofloxacin and norfloxacin was for Coagulasis-positive Staphylococcus and Staphylococcus aureus. The data found indicate that milk analyzed has inadequate hygiene conditions, existence of antimicrobial residues and the isolated pathogens are multidrug resistant indicating risks to public health.