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A Farm to Fork Risk Assessment for the Use of Wastewater in Agriculture in Accra, Ghana

Antwi-Agyei, P; Cairncross, S; Peasey, A; Price, V; Bruce, J; Baker, K; Moe, C; ... Ensink, J; + view all (2015) A Farm to Fork Risk Assessment for the Use of Wastewater in Agriculture in Accra, Ghana. PLOS ONE , 10 (11) , Article e0142346. 10.1371/journal.pone.0142346. Green open access

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Abstract

The need to minimise consumer risk, especially for food that can be consumed uncooked, is a continuing public health concern, particularly in places where safe sanitation and hygienic practices are absent. The use of wastewater in agriculture has been associated with disease risks, though its relative significance in disease transmission remains unclear. This study aimed at identifying key risk factors for produce contamination at different entry points of the food chain. Over 500 produce and ready-to-eat salad samples were collected from fields, markets, and kitchens during the dry and wet seasons in Accra, Ghana, and over 300 soil and irrigation water samples were collected. All samples were analysed for E. coli, human adenovirus and norovirus using standard microbiological procedures, and real time RT-PCR. Finally, critical exposures associated with microbial quality of produce were assessed through observations and interviews. The study found that over 80% of produce samples were contaminated with E. coli, with median concentrations ranging from 0.64 to 3.84 Log E. coli/g produce. Prepared salad from street food vendors was found to be the most contaminated (4.23 Log E. coli/g), and that consumption of salad exceeded acceptable health limits. Key risk factors identified for produce contamination were irrigation water and soil at the farm level. Storage duration and temperature of produce had a significant influence on the quality of produce sold at markets, while observations revealed that the washed water used to rinse produce before sale was dirty. The source of produce and operating with a hygiene permit were found to influence salad microbial quality at kitchens. This study argues for a need to manage produce risk factors at all domains along the food chain, though it would be more effective to prioritise at markets and kitchens due to cost, ease of implementation and public health significance.

Type: Article
Title: A Farm to Fork Risk Assessment for the Use of Wastewater in Agriculture in Accra, Ghana
Open access status: An open access version is available from UCL Discovery
DOI: 10.1371/journal.pone.0142346
Publisher version: http://doi.org/10.1371/journal.pone.0142346
Language: English
Additional information: © 2015 Antwi-Agyei et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Keywords: Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, URBAN VEGETABLE PRODUCTION, NORWALK VIRUS, CONTAMINATION, QUALITY, FOOD, REDUCTION, INFECTION, LETTUCE, PRODUCE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Epidemiology and Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Epidemiology and Health > Epidemiology and Public Health
URI: https://discovery.ucl.ac.uk/id/eprint/1479060
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