Catalyst - Blue Tongue
Catalyst travels to England where a nasty side effect of global warming has occurred. A disease that normally only occurs in tropical or subtropical parts of the world made its first appearance in the UK last spring. It could be the first hard evidence that global warming is starting to change disease patterns around the world.
While this story carries an important message about human disease, this time at least, it was an animal disease that has moved. It's the blue tongue virus, which affects cattle, sheep and goats. It can be a devastating illness with up to a 70% mortality rate in sheep.
We follow the scientific detective story to unravel how the African virus made it all the way to England. And this story gives some valuable insights into the future spread of human diseases with climate change, such as the movement of Dengue fever into the more southern regions of Australia.
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