a vaccine contaminant and polyomavirus

This Simian Virus 40 was transferred from monkey to humans through vaccine development. The virus was first identified in 1960 in cultures of rhesus monkey kidney cells that were being used to produce polio vaccine… SV40 acts much like the human JC and BK polyomaviruses, producing kidney disease and sometimes a demyelinating disease similar to PML (polio). In other species, particularly hamsters, SV40 causes a variety of tumors, generally sarcomas. Several studies have suggested a link to cancer based on the presence of relatively large amounts of what may be SV40 DNA fragments in tumor tissues, particularly mesotheliomas and non-Hodgkin’s lymphoma.

Wikipedia: http://en.wikipedia.org/wiki/SV40

Present in these vaccines:
polio vaccine from 1956 to 1963, but the monkey virus has been passed through the placenta and breast milk to subsequent generations.

Simian vacuolating virus 40, Simian virus 40