Taken from video description
A form of deadly leukemia was found to be contagious in a species of clams. Are other cancers contagious?
Deadly, Contagious Form of Leukemia is Devastating Atlantic Clams
“Populations of soft-shelled clams along the east coast of North America are being devastated by outbreaks of a fatal leukemia-like disease.”
Is Cancer Contagious?
“My boyfriend has cancer and I am worried about it possibly being contagious.”
Clonally transmissible cancers in dogs and Tasmanian devils
“Tasmanian devil facial tumor disease (DFTD) and canine transmissible venereal tumor (CTVT) are the only known naturally occurring clonally transmissible cancers.”
Discovery News http://discoverynews.com