World-wide virologists are alarmed by the prospect of a pandemic of Avian Flu.
At the back of their minds they are haunted by the spectre of Spanish Flu which broke out at the end of the First World War and killed more people that the conflict itself.
Since then the world has been made increasingly safe by vaccines, or has it?
Two hundred years on from Edward Jenner?s experiments with cowpox, Ruth Richardson reflects on some of the key stages in vaccination?s fight against deadly diseases.
Listen to the programme
First broadcast 17 December 2008
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