DNA from JC polyomavirus and Merkel cell polyomavirus has been detected in chorionic villi from pregnant women and women affected by miscarriage. DNA from BK polyomavirus has also been detected in the same tissues but to a lesser extent.
The presence of DNA from JC polyomavirus, Merkel cell polyomavirus, and BK polyomavirus has been detected in the chorionic villi of both pregnant women and those who have experienced miscarriages.