Reference summary — not medical advice or a personal risk estimate.
Merkel cell polyomavirus (MCPyV)
Group 1 — carcinogenic to humansInfectionsbiologicalEvidence: sufficient_in_humans
Summary
A common skin virus that causes a rare aggressive skin cancer.
Detail
MCPyV is Group 1 with sufficient evidence for Merkel cell carcinoma. Most adults are infected without symptoms; the cancer is rare and mainly occurs in elderly or immunosuppressed people.
Regional relevance
global
global
Sources
Primary sources
Consumer references
Third-party tools some readers use alongside primary evidence. Meyron doesn't endorse them; we link them because you'll otherwise hit them anyway.
- California Prop 65 list
State of California's list of chemicals known to cause cancer or reproductive harm.