Cross Species Transfer of diseases that cause cancer
Around 100 million people were vaccinated with Jonas Salk’s IM polio vaccine that was cultured in monkey kidneys (normal procedure to manufacture/bioengineer vaccines and pharmaceuticals in animal organs today) and millions became infected with a monkey virus called monkey SV1-SV40. This is a cross species transfer of a virus. This one is documented. Millions …“were exposed to live SV40 from 1955 through early 1963 when they were administered SV40-contaminated virus vaccines, with the major source being polio vaccines {100 million people} Adenovirus 3 and 7 vaccines used from 1961 through 1965 contained hybrid particles that had SV40 sequences in recombinant genomes.” Despite being completely inactivated with formaldehyde, cytopathogenic agents were found. Also, these agents cause and have caused multiple types of cancer.
Sauce
https://pdfs.semanticscholar.org/d5dc/18f69827be3efc4afd7c7c817333b33d2dcc.pdf
https://bmj.com/content/344/bmj.e2398/rr/596772
https://academic.oup.com/jnci/article/91/2/119/2549299
https://ncbi.nlm.nih.gov/pubmed/10472327
https://ncbi.nlm.nih.gov/pmc/articles/PMC1383764/