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Manufacturer Sanofi Pasteur MSD has recalled 88% of its stock - 16 batches - of Typhim Vi vaccine because tests found some samples were too weak.
Anyone immunised with the vaccine since January 2011 could be affected.
Officials stress that the vaccine was safe and posed no health threat.
But it could mean as many as 729,606 people who potentially received the affected vaccine are not fully immunised against typhoid/edit on 8-10-2012 by christafinias because: (no reason given)
Experts say people should not get revaccinated but should take precautions against typhoid when abroad.