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Hydroponic greenhouse tomato production’s popularity has grown in the United States to meet the demands for year-round availability of fresh tomatoes. Although  Salmonella  has been the cause of several foodborne illness outbreaks linked to tomatoes, the potential for contamination in hydroponic production is not well understood. The objectives of this study were to determine whether biweekly inoculation of  Salmonella  in a hydroponic tomato nutrient solution would lead to  Salmonella  survival and contamination of the tomato fruit and plants, hydroponic nutrient film technique (NFT) troughs, and water receptacles. An avirulent strain of  Salmonella  Typhimurium was used to contaminate the nutrient solution at a concentration of 10 5  colony-forming units (CFU)/mL. Inoculation was conducted on day 0 and biweekly until the termination of project at 12 weeks; samples were filtered and plated on selective media. Leaves and biofilm coupons were collected on day 0 and every 2 weeks postinoculation. Leaf samples were analyzed using culture methods. The biofilm coupons were analyzed using tape fluorescence in situ hybridization (FISH) method. Fruit samples were collected 6 weeks postinoculation until termination of project and analyzed using culture methods. Typical  Salmonella  morphology of colonies on plates streaked from overnight cultures from plant samples were confirmed by automated ribotyping. A 2-log 10  reduction of cells was observed in water samples 2 days post initial inoculation. Reduction continued over the 2-week period with few cells surviving until the next inoculation.  S.  Typhimurium was observed on the surface of the root systems. However, a splash incident resulted in low-level contamination of selected leaves and fruit samples. The results of the study indicate that although contaminated hydroponic nutrient solution led to surface contamination of roots, such an event may not pose a high risk of contamination of hydroponically grown fruit.

Transmission and Persistence of Salmonella enterica in Nutrient Solution of Hydroponic Greenhouse Grown Tomatoes