HC Deb 13 March 1957 vol 566 c191W
Mr. Viant

asked the Minister of Health whether he will state the cause of the change in colour of 47 phials of the recent batch of poliomyelitis vaccine.

Mr. Vosper

The change of colour was due to faulty containers and consequent discoloration of the contents by a microorganism, which is, however, completely harmless.

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