| isolation and characterization of shiga toxin-producing escherichia coli o157:h7 and non-o157 from beef carcasses at a slaughter plant in mexico. | the contamination of beef carcasses with shiga toxin-producing o157:h7 and non-o157 escherichia coli (stec) obtained from a slaughter plant in guadalajara, mexico was investigated. a total of 258 beef carcasses were sampled during a 12-month period. all samples were assayed for stec by selective enrichment in modified tryptone soy broth supplemented with cefixime, cefsulodin and vancomycin, followed by plating on sorbitol macconkey agar supplemented with cefixime and tellurite (ct-smac). simulta ... | 2007 | 17007951 |
| incidence of salmonella, listeria monocytogenes, escherichia coli o157:h7, and staphylococcal enterotoxin in two types of mexican fresh cheeses. | handcrafted fresh cheeses are popular among consumers in mexico. however, unsafe raw materials and inadequate food safety practices during cheese manufacture and preservation make them a potential public health risk. the incidence of salmonella, listeria, escherichia coli o157:h7, and staphylococcal enterotoxin was analyzed in two types of fresh cheese (panela and adobera) commonly marketed in mexico. a total of 200 samples, 100 panela and 100 adobera, were acquired from 100 wholesale milk prod ... | 2012 | 22221358 |