Scientists have discovered a previously unknown virus and strongly linked it with the most aggressive form of skin cancer, they reported in a scientific journal on Thursday. The cancer, Merkel cell carcinoma, tends to occur most often on the sun-exposed areas of the body like the face, the head and the neck. Although it is rare, its incidence tripled from 1986 to 2001, and it now accounts for an estimated 1,200 cases in this country each year, the National Cancer Institute says.
