This article may give some insights into how P. ramorum can persist in a stream environment:
Islands of Germs: Researchers Discover Pathogens Floating on Tiny Clumps of Aquatic Detritus
Researchers have found evidence that "marine snow"--aggregates of organic material floating in water bodies--may act as microscopic, island-like refuges for pathogens, or disease-causing organisms. This detritus may skew water sampling procedures and mathematical models used to predict the transmission of waterborne diseases to humans.
(follow the link above to read the whole article)
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