The ban on air travel in much of Europe is putting the lives of people waiting for bone marrow transplants at risk.
The disruption caused by the Icelandic volcano ash cloud means patients have been left waiting for treatment. In the UK, 16 bone marrow treatments scheduled over recent days have not taken place, the BBC has learned.
The Anthony Nolan Trust, which arranges the worldwide transport of bone marrow, says couriers have had to use trains and ferries to enter the UK. The bone marrow is used to treat leukaemia and lymphoma. A spokesman for the trust said bone marrow had to be moved within 72 hours before the cells died.
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