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A transmissible cancer of soft-shell clams

A leukemia-like cancer is killing soft-shell clams along the east coast of North America. The cancer is transmitted between animals in the ocean, and appears to have originated in a single clam as recently as 40 years ago. Hemic neoplasm is a disease of marine bivalves that is characterized by proliferation of morphologically and functionally aberrant hemocytes, the …

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Infectious agents with no genome

If the reader does not believe that viroids and satellites are distinctive, then surely prions, infectious agents composed only of protein, must impress. The question of whether infectious agents exist without genomes arose with the discovery and characterization of infectious agents associated with a group of diseases called transmissible spongiform encephalopathies (TSEs). These diseases are …

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