15 January 2012 Last updated at 21:17 ET
London 2012: Mass gathering risks disease spreading
The Olympic Games will see an influx of people to London, from around the world.
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Mass gatherings, such as the London 2012 Olympics, can be a hotbed of diseases from across the world, public health experts have warned.
link-
http://www.bbc.co.uk/news/health-16545017