Vaccine Virus 'Cancer Link'

A monkey virus found in early versions of a vaccine against polio may be linked to a common type of cancer, suggest scientists. However, other experts are still doubtful whether the virus - or the vaccine - can be blamed.

Batches of polio vaccine tainted with "simian virus 40" (SV40) were given between 1955 and 1963.

This was because monkey kidney cells were used in the jab's production process.

Approximately 30m people may have been given the contaminated vaccine between these dates.'

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