Joseph Fuh Nfongeh

Abstract

Background: Carbapenemase-producing Escherichia coli (CPEC) has been an issue of public health concern due to high resistance to major antibiotics. This pathogen can be acquired through the consumption of contaminated foods. The use of detergents for the control of pathogens in food contact surfaces is commonly practiced by most food vendors. This study is aimed at assessing the efficacy of some commonly used detergents against CPEC from food contact surfaces in Nasarawa State, Nigeria. Materials and Methods: A total of 924 swab samples from food contact surfaces (246 each from plates, cups and spoons and 186 from tabletops) in various food vending outlets were screened for phenotypic identification of CPEC using Imipenem (30µg) and Meropenem (10µg) antibiotics susceptibility disk diffusion method. Tubes of varying concentrations of test detergents (1:140, 1:160, 1:180, 1:200 and 1:220) were seeded against phenol as standard with varying concentrations of 1:50, 1:60, 1:70 1:80 and 1:90. Results: Hawkers outlets had highest CPEC isolation frequencies among swab samples and E. coli isolates with values of 3.33% and 7.70% respectively while cups and spoons surfaces had highest samples (1.63%) and isolates (7.69%) frequencies respectively. Overall CPEC isolation frequencies were 1.30% and 6.00% among the screened samples and E. coli isolates respectively. Though there was significant difference (p0.05. Highest phenol coefficient value of 2.6 was obtained for MFD while SLD and LPD had 2.3 and 1.7 respectively. The difference in the phenol coefficient values among the detergents were statistically insignificant (p>0.05). Conclusion: All detergents used in this study were effective against CPEC isolated from the food contact surfaces. Using locally produced detergents in appropriate concentrations especially for low-income earners is quite promising and is a good alternative to other branded detergents.   Keywords: Carbapenemase-producing E. coli, Detergents, Efficacy, Food contact surfaces, Nigeria.

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Abstract

Introduction: Contamination of food contact surfaces by increases the risk of food-borne diseases through cross-contamination which becomes more complicated with the development of multidrug resistance by the pathogen. This study was aimed at investigating multidrug resistance and carriage of carbapenemase genes among isolates from food contact surfaces in Nasarawa State, Nigeria. Materials and Methods : A total of 924 swab samples (522 from Lafia and 402 from Nasarawa Eggon) were collected from various food contact surfaces in food vending outlets and screened for multidrug resistance and carbapenemase genes in isolates using standard culture, modified Kirby-Bauer disk diffusion, PCR amplification and agarose gel electrophoresis techniques. Data obtained were statistically analyzed and p-value set at 0.05 confidence level. Results: Highest overall contamination prevalence of 43.33 % was obtained from hawkers’ outlets while table top surfaces had 35.43% with highest risk (odd ratio) of 1.94. Eateries and Hotels had no contamination. The prevalence values were significantly different (p Conclusion: The presence of multidrug resistant with carbapenemase genes from food contact surfaces in vending outlets serves as a public health challenge and the need for personal hygiene and strict adherence to antibiotics protocols by food vendors is highly encouraged.   Keywords: Multidrug resistance, carbapenemase genes, food contact surfaces, Escherichia coli, Nigeria

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