"Another important consideration in attempts to eradicate poliomyelitis by vaccination is the contamination of polio vaccines by chimpanzee coryza virus, renamed respiratory syncytial virus (RSV)." https://www.bmj.com/content/344/bmj.e2398/rr/599724
"It is no secret that the source of RSV is the contaminated polio vaccines in both developing and developed countries." https://medicalveritas.org/contamination-of-polio-vaccines/
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