'Five of the new substances added are actually viruses that either cause cancer directly or make it easier for other cancer-causing viruses to do their deadly work. They include: Human immunodeficiency virus type 1 (HIV-1); Human T-cell lymphotropic virus type 1 (HTLV-1); Epstein-Barr virus (EBV); Kaposi sarcoma-associated herpesvirus (KSHV); Merkel cell polyomavirus (MCV). All five of these viruses are classified as "Known to be a human carcinogen," as opposed to the agency's other category of "Reasonably anticipated to be a human carcinogen."
As for Epstein-Barr, the NIH says that 90 percent of all adults are already infected with the herpes-related virus but most of our immune systems hold it in check. It has, however been implicated in four types of lymphoma: "Burkitt, Hodgkin, immune-suppression-related non-Hodgkin, and nasal type extranodal NK/T-cell — and two types of epithelial cancer — nasopharyngeal cancer and some types of stomach cancer," says the agency.
In addition to the five viruses, the industrial solvent Trichloroethylene (TCE) has received a bump in status from "reasonably anticipated human carcinogen" to "known human carcinogen" due to its role in increasing kidney cancer risk.
The final of the seven cancer-causers are "cobalt and cobalt compounds that release cobalt ions in vivo" which join the list with "reasonably anticipated" status.'
Photo: Apple blossom