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Opportunistic pathogens related to degradation in water quality are of concern to both wildlife and public health. The objective of this study was to identify spatial, temporal, and environmental risk factors for  E. coli  colonization among Atlantic bottlenose dolphins ( Tursiops truncatus ) inhabiting the Indian River Lagoon (IRL), FL between 2003 and 2007. Age, gender, capture location, coastal human population density, proximity of sewage treatment plants, number of septic tanks, cumulative precipitation 48 hrs and 30 days prior to capture, salinity, and water temperature were analyzed as potential risk factors. Highest  E. coli  colonization rates occurred in the northern segments of the IRL. The risk of  E. coli  colonization was the highest among the youngest individuals, in counties with the highest cumulative rainfall 48 hrs and in counties with the highest number of septic systems during the year of capture. The prevalence of colonization was the highest during 2004, a year during which multiple hurricanes hit the coast of Florida. Septic tanks, in combination with weather-related events suggest a possible pathway for introduction of fecal coliforms into estuarine ecosystems. The ability of  E. coli  and related bacteria to act as primary pathogens or cause opportunistic infections adds importance of these findings.

Risk Factors for Colonization ofE. coliin Atlantic Bottlenose Dolphins (Tursiops truncatus) in the Indian River Lagoon, Florida