Microbial quality and prevalence of foodborne pathogens of cheeses commercialized at different retail points in Mexico

Abstract Microbial quality and the prevalence of foodborne pathogens (E. coli 0157:H7, Salmonella spp., Listeria monocytogenes and Campylobacter jejuni) of cheeses sold at three retail points (supermarkets [SM], street markets [ST], and convenience grocery stores [CGS]) in Chihuahua, Mexico, were ev...

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Hauptverfasser: CHÁVEZ-MARTÍNEZ, América, PAREDES-MONTOYA, Pedro, Ana-Luisa RENTERÍA-MONTERRUBIO, CORRAL-LUNA, Agustín, LECHUGA-VALLES, Ruth, DOMINGUEZ-VIVEROS, Joel, SÁNCHEZ-VEGA, Rogelio, SANTELLANO-ESTRADA, Eduardo
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creator CHÁVEZ-MARTÍNEZ, América
PAREDES-MONTOYA, Pedro
Ana-Luisa RENTERÍA-MONTERRUBIO
CORRAL-LUNA, Agustín
LECHUGA-VALLES, Ruth
DOMINGUEZ-VIVEROS, Joel
SÁNCHEZ-VEGA, Rogelio
SANTELLANO-ESTRADA, Eduardo
description Abstract Microbial quality and the prevalence of foodborne pathogens (E. coli 0157:H7, Salmonella spp., Listeria monocytogenes and Campylobacter jejuni) of cheeses sold at three retail points (supermarkets [SM], street markets [ST], and convenience grocery stores [CGS]) in Chihuahua, Mexico, were evaluated (n=90). The most commonly found cheeses in the retail points were Chihuahua (60%) and Ranchero (28.8%). According to Mexican standards, three SM, two CGS, and none of the ST cheeses complied with the regulations. Two cheeses (cheddar and Ranchero) from SM (2.22%) were positive for L. monocytogenes. Eight cheeses (8.88%) were positive for Salmonella spp. (5 from ST and 3 from CGS). E.coli 0157:H7 and Campylobacter jejuni were negative in all samples. In the Ranchero cheese, total coliforms (TC), faecal coliforms (FC), and yeast and moulds (Y&M) showed no significant differences (P > 0.05) among retail points. Nevertheless, in Chihuahua cheese, the numbers of total coliforms, faecal coliforms, and yeast and moulds were statistically different (P < 0.05) among retail points. PSM Chihuahua cheese had the lowest numbers of total (0.99 ± 1.0 Log10CFU/g) and faecal coliforms (166 ± 154 Log10CFU/g). CGS cheeses had the lowest counts in terms of yeast and moulds (3.1 ± 2.2 Log10CFU/g). The results revealed that most cheeses, regardless of the retail point, did not conform to Mexican standards. The number of total and faecal coliforms indicates either flaws during the production and commercialization processes or the ill-handling of raw materials.
doi_str_mv 10.6084/m9.figshare.11350346
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The most commonly found cheeses in the retail points were Chihuahua (60%) and Ranchero (28.8%). According to Mexican standards, three SM, two CGS, and none of the ST cheeses complied with the regulations. Two cheeses (cheddar and Ranchero) from SM (2.22%) were positive for L. monocytogenes. Eight cheeses (8.88%) were positive for Salmonella spp. (5 from ST and 3 from CGS). E.coli 0157:H7 and Campylobacter jejuni were negative in all samples. In the Ranchero cheese, total coliforms (TC), faecal coliforms (FC), and yeast and moulds (Y&amp;M) showed no significant differences (P &gt; 0.05) among retail points. Nevertheless, in Chihuahua cheese, the numbers of total coliforms, faecal coliforms, and yeast and moulds were statistically different (P &lt; 0.05) among retail points. PSM Chihuahua cheese had the lowest numbers of total (0.99 ± 1.0 Log10CFU/g) and faecal coliforms (166 ± 154 Log10CFU/g). CGS cheeses had the lowest counts in terms of yeast and moulds (3.1 ± 2.2 Log10CFU/g). The results revealed that most cheeses, regardless of the retail point, did not conform to Mexican standards. 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The most commonly found cheeses in the retail points were Chihuahua (60%) and Ranchero (28.8%). According to Mexican standards, three SM, two CGS, and none of the ST cheeses complied with the regulations. Two cheeses (cheddar and Ranchero) from SM (2.22%) were positive for L. monocytogenes. Eight cheeses (8.88%) were positive for Salmonella spp. (5 from ST and 3 from CGS). E.coli 0157:H7 and Campylobacter jejuni were negative in all samples. In the Ranchero cheese, total coliforms (TC), faecal coliforms (FC), and yeast and moulds (Y&amp;M) showed no significant differences (P &gt; 0.05) among retail points. Nevertheless, in Chihuahua cheese, the numbers of total coliforms, faecal coliforms, and yeast and moulds were statistically different (P &lt; 0.05) among retail points. PSM Chihuahua cheese had the lowest numbers of total (0.99 ± 1.0 Log10CFU/g) and faecal coliforms (166 ± 154 Log10CFU/g). CGS cheeses had the lowest counts in terms of yeast and moulds (3.1 ± 2.2 Log10CFU/g). The results revealed that most cheeses, regardless of the retail point, did not conform to Mexican standards. 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The most commonly found cheeses in the retail points were Chihuahua (60%) and Ranchero (28.8%). According to Mexican standards, three SM, two CGS, and none of the ST cheeses complied with the regulations. Two cheeses (cheddar and Ranchero) from SM (2.22%) were positive for L. monocytogenes. Eight cheeses (8.88%) were positive for Salmonella spp. (5 from ST and 3 from CGS). E.coli 0157:H7 and Campylobacter jejuni were negative in all samples. In the Ranchero cheese, total coliforms (TC), faecal coliforms (FC), and yeast and moulds (Y&amp;M) showed no significant differences (P &gt; 0.05) among retail points. Nevertheless, in Chihuahua cheese, the numbers of total coliforms, faecal coliforms, and yeast and moulds were statistically different (P &lt; 0.05) among retail points. PSM Chihuahua cheese had the lowest numbers of total (0.99 ± 1.0 Log10CFU/g) and faecal coliforms (166 ± 154 Log10CFU/g). CGS cheeses had the lowest counts in terms of yeast and moulds (3.1 ± 2.2 Log10CFU/g). The results revealed that most cheeses, regardless of the retail point, did not conform to Mexican standards. The number of total and faecal coliforms indicates either flaws during the production and commercialization processes or the ill-handling of raw materials.</abstract><pub>SciELO journals</pub><doi>10.6084/m9.figshare.11350346</doi><oa>free_for_read</oa></addata></record>
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FOS: Other engineering and technologies
title Microbial quality and prevalence of foodborne pathogens of cheeses commercialized at different retail points in Mexico
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