http://www.bbc.co.uk/news/world-europe-13639617 Bad news this but is it another case of "Typhoid Mary" http://en.wikipedia.org/wiki/Typhoid_Mary
There was a huge outbreak of Typhoid in Aberdeen in the 1960's and the suspected culprit was a tin of Argentinian corned beef. The city was quarantined for some time. We're still waiting for the borders to be lifted