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U.S. Fish and Wildlife statistician, Dr. Nicholas Som, a career mathematician and former school teacher in Colorado, draws the life cycle of Ceratonova shasta on a chartboard, showing alternation between salmonid fish and polychaete worm hosts, "There was a thought that if we could disrupt the transmission of the spores between the salmon and the worms, or vice versa, or disrupt the habitat that the worms depend on, that might be an effective management tool for reducing impacts of the disease,” he said. Credit: John Heil/USFWS