Presence and antimicrobial resistance ofEscherichia coliisolated from foodstuffs in Hidalgo State (Mexico) Presencia y resistencia a antimicrobianos deEscherichia coliaislados a partir de alimentos en el estado de Hidalgo (México)

Abstract

The presence of Escherichia coli in foods taken from the grocery stores and the supermarkets in Hidalgo State (Mexico) was determined for 73 samples of poultry meat, 60 samples of pork, 86 samples of beef, and 66 samples of vegetables. A total of 352 E. coli strains were isolated, identified, and analyzed by an agar disk diffusion assay for their resistance to 10 antimicrobials. Poultry meat and vegetables taken from groceries showed significantly higher counts (P ¼ 0.0002 and P ¼ 0.0461, respectively) when compared with the samples taken from supermarkets. Compared with the isolates recovered from other foods, E. coli isolated from chicken meat had higher levels of antimicrobial resistance against all antimicrobials tested, with the exceptions of nitrofurantoin resistance of isolates from pork and streptomycin resistance in isolates from pork and beef. In addition, the E. coli isolates from samples taken from the groceries showed higher resistance rates than the isolates from samples taken from the supermarkets for the cases of pork isolates resistance to ampicillin (P ¼ 0.0497), chloramphenicol (P ¼ 0.0075), doxycycline (P ¼ 0.002), and streptomycin (P ¼ 0.0094) and beef isolates resistance against ampicillin (P ¼ 0.0048), streptomycin (P ¼ 0.002), and sulfisoxazole (P ¼ 0.003). The present study revealed that the observed resistance rates correlated well with those reported in the national surveillance programmes of developed countries, with the exception of isolates from chicken meat, which have higher resistance rates. Also, from a microbiological safety point of view, samples taken from supermarkets were in a much better conditions than those obtained from the groceries.Keywords: E. coli; antimicrobial; food-borne; resistance; Me´xico La presencia de Escherichia coli fue investigada en 73 muestras de carne de pollo, 60 muestras de carne de cerdo, 86 muestras de carne de vacuno y 66 muestras de alimentos vegetales muestreados en pequen˜os ultramarinos y supermercados en el estado de Hidalgo (Me´xico). Un total de 352 aislamientos de E. coli fueron seleccionados, identificados y analizados mediante el me´todo de difusio´n en disco para determinar su resistencia a 10 antimicrobianos. Las muestras de pollo y vegetales obtenidas en tiendas de alimentacio´n mostraron recuentos de E. coli significativamente mayores (P ¼ 0,0002 y P ¼ 0,0461 respectivamente) que las obtenidas en supermercados. Comparados con los procedentes de los restantes alimentos, los E. coli obtenidos a partir de carne de pollo mostraron un mayor grado de resistencia a todos los antimicrobianos estudiados, excepto en lo referente a la nitrofurantoı´na en el caso de los aislados a partir de carne de cerdo y la estreptomicina respecto de los aislamientos de carne de cerdo y vacuno. Adicionalmente, en algunos casos, los E. coli obtenidos a partir de alimentos muestreados en pequen˜os ultramarinos mostraron mayores tasas de resistencia que los procedentes de alimentos muestreados en supermercados. Esto ocurrio´en los aislamientos procedentes de ca...

Determination of quinolones in milk samples using a combination of magnetic solid‐phase extraction and capillary electrophoresis

“…Samples with QNs concentrations higher than linear range were diluted tenfold with electrolyte solution. The concentrations found are higher than those reported in milk samples from other countries []. These results are congruent with the antibiotic resistance found for Escherichia coli isolated from Food Stuffs in Hidalgo [].…”

“…The concentrations found are higher than those reported in milk samples from other countries []. These results are congruent with the antibiotic resistance found for Escherichia coli isolated from Food Stuffs in Hidalgo []. A confirmation using mass spectrometry is also required.…”