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Survival of Salmonella enterica in Freshwater and Sediments and Transmission by the Aquatic Midge Chironomus tentans (Chironomidae: Diptera). Barry C. Moore, 2003.Survival of a nalidixic acid-resistant strain of Salmonella enterica serovar Typhimurium mr-DT-104 in water and sediments was tested using artificially contaminated aquaria . Water samples remained culture positive for salmonella for up to 54 days . Sediment samples were culture positive up to 119 days . In addition, potential mechanisms for spreading salmonella in the environments by chironomid larvae and adults were tested . We evaluated the acquisition of mr-DT-104 by chironomids from contaminated aquatic sediments and subsequent spread to uncontaminated sediments . Larval chironomids raised in contaminated sediments became culture positive, and the bacteria were carried over to adults after emergence . Contamination of clean sediments by chironomid larvae was not demonstrated . These findings clearly suggest that mr-DT-104 serovar organisms can survive in aquatic sediments for at least several months . Uptake of salmonellae by chironomid larvae and adults suggests that they are possible vectors of mr-DT-104 in both aquatic and terrestrial environments, although the role of larval defecation in movement of bacteria to new sediments was not demonstrated .
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