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Contagious cancer found in clams: third example of transmissible malignancy no threat to people.
A leukemia-like disease in soft-shell clams is a contagious cancer that spreads from clam to clam, a new study finds.
The disease probably originated in a single soft-shell clam at least 40 years ago, researchers report in the April 9 Cell. Cancer cells somehow migrated to other clams and infected them, eventually spreading the disease up and down the eastern North American coast from Canada's Prince Edward Island to the Chesapeake Bay.
It is not clear how the disease moves or...
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