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Le risque lie a l’utilisation des eaux usees en agriculture depend de la duree de survie des microorganismes pathogenes sur les cultures. Ce travail a pour objectif de suivre in situ la duree de survie de E. coli , des oeufs et des kystes de parasites sur la carotte, l’aubergine et la laitue. Les cultures ont recu de l’eau polluee a la maturite, et elles ont ete echantillonnees et analysees pendant une semaine. En saison pluvieuse, une chute de 73%, 83%, 97% de E. coli a ete obtenu sept jours apres sur la laitue, la carotte et l’aubergine respectivement. En saison seche, cette baisse a ete respectivement de 97%, 95% et 99%. Malgre le fort pourcentage de chute, excepte l’aubergine, le taux de E. coli est reste superieur aux seuils sanitaires (10 3 E. coli /g). Le pourcentage d’echantillon positif en oeufs et en kyste, varie entre 0 et 25% sur la laitue et la carotte, et entre 0 et 8% sur l’aubergine. Ce qui est un danger pour les consommateurs de ces legumes qui se consomment cru. Afin d’eviter ou de reduire le risque lie a cette pratique, les maraichers devrait arreter l’arrosage des cultures au moins une semaine avant la recolte. © 2019 International Formulae Group. All rights reserved Mots cles: Agriculture urbaine, eau polluee, legumes, risque sanitaire, zone tropicale humide English Title: Persistence of E. coli , helminth eggs and protozoan cysts contained in urban waste water on vegetable crops in Dschang, West Cameroon English Abstract The risk associated with the use of wastewater in agriculture depends on the survival time of pathogenic microorganisms on crops. This work aims to follow in situ the survival time of E. coli , parasite eggs and cysts on carrot, eggplant and lettuce. The crops received polluted water at maturity, and they were sampled and analyzed for one week. In the rainy season, drops a fall of 73%, 83%, 97% of E. coli was obtained seven days later on lettuce, carrot and eggplant respectively. In dry seasons, this drop was respectively 97%, 95% and 99%. Despite the high percentage of fall, except eggplant, the rate of E. coli remained above the health  thresholds (10 3 E. coli / g). The percentage of positive sample in eggs and cyst, varies between 0 and 25% on lettuce and carrot, and between 0 and 8% on eggplant. This is a danger for consumers of these vegetables that are consumed raw. In order to avoid or reduce the risk associated with this practice; market gardeners should stop watering crops at least one week before harvest. © 2019 International Formulae Group. All rights reserved Keywords: Urban agriculture, polluted water, vegetables, health risk, wet tropical zone

international journal of biological and chemical sciences

Persistance de &lt;i&gt;E. coli&lt;/i&gt;, des oeufs d’helminthes et des kystes de protozoaires contenus dans les eaux usées urbaines d’arrosage sur les cultures maraîchères à Dschang, Ouest-Cameroun