Listeria monocytogenes Strains Isolated From Dry Milk Samples in Mexico: Occurrence and Antibiotic Sensitivity

Dry milk is a particular concern in Mexico, as approximately 150,000 metric tons of dry milk are imported every year at a cost of around $250 million. Dry milk is used to make many products, most of which are dairy products widely distributed among the population covered by welfare programs. The pur...

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Bibliographic Details
Published in:Journal of environmental health 2013-09, Vol.76 (2), p.32-37
Main Authors: RODAS-SUAREZ, O. R, QUINONES-RAMIREZ, E. I, FERNANDEZ, F. J, VAZQUEZ-SALINAS, C
Format: Article
Language:English
Subjects:
Animals
Anti-Bacterial Agents
Antimicrobial agents
Bacteria
Biological and medical sciences
Company distribution practices
Complications and side effects
Contamination
Dairy farms
Dairy products
Distribution
Dried milk
Drug resistance in microorganisms
Drug Resistance, Bacterial
Dry milk
Drying
Environment. Living conditions
Food Contamination - analysis
Food processing industry
Health
Humans
Identification systems
Listeria
Listeria monocytogenes
Listeria monocytogenes - drug effects
Listeria monocytogenes - isolation & purification
Medical sciences
Mexico
Microbial drug resistance
Microbial Sensitivity Tests - methods
Microbiology
Milk
Milk - microbiology
Physiological aspects
Public health. Hygiene
Public health. Hygiene-occupational medicine
Risk factors
Seawater
Strain
Sulfonamides
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Summary:Dry milk is a particular concern in Mexico, as approximately 150,000 metric tons of dry milk are imported every year at a cost of around $250 million. Dry milk is used to make many products, most of which are dairy products widely distributed among the population covered by welfare programs. The purpose of the study described in this article was to determine the presence of Listeria spp. in imported dry milk samples in Mexico, and to determine the sensitivity of the Listeria monocytogenes isolates to different antimicrobial agents. Listeria isolates (7.8% of 550 bacterial isolates) were identified as L. monocytogenes (53.49%), L. innocua (30.23%), L. seeligeri (13.95%), and L. ivanovii (2.33%). L. monocytogenes strains isolated showed multiresistance to ampicillin, erythromycin, tetracycline, dicloxacillin, and trimethoprim-sulfamethoxazole (9%-14%). The results provide additional evidence of the emergence of multiresistant Listeria strains both in nature and in widely consumed dairy products, representing a potential threat to human health.
ISSN:0022-0892