Parasite gives a man cancer

In rare case, a patient’s weakened immune system may have let tapeworm spread disease

PETRIFYING PARASITE Dwarf tapeworms (Hymenolepis nana, shown) can become a horrifying problem for people with weakened immune systems. Cells from one man’s tapeworms turned into cancer cells and spread throughout his body.

Courtesy Peter Olson/Natural History Museum, London

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