The vaccine Pandemrix, which makes up the bulk of NHS supply, contains a chemical called an adjuvant that has never been tested on mums-to-be.

According to the WHO Strategic Advisory Group, pregnant women should be given adjuvant-free formulations of the vaccine whenever possible.

But the Department of Health’s Director of Immunisations Professor David Salisbury said that even though the NHS has stocks of an alternative vaccine called Celvapan, it will not be prioritised for pregnant women.

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