invasion of the Virions
Science fiction could scarcely have dreamt up anything stranger than the virions. But these invaders are real enough; they are the whole family of viruses, from smallpox and rabies down to influenza and the common cold.
Where do the invaders come from? Why are they so difficult to fight? And faced with such subtle and devious attackers, is there anything at all we can do to resist? Narrator PAUL VAUGHAN
Editor SIMON CAMPBELL-JONES
Written and produced by RICHARD REISZ