Dr Cherry Radford from London's Moorfields Eye Hospital said the chances of contracting the infection were still very low.

BBC: Blindness risk for contact lens wearers

Horrified onlookers watched as the helicopter hit the crane amid low cloud and fog near Vauxhall station, south of the river and not far from landmarks such as the London Eye and the Houses of Parliament, and came plunging to the ground.

CNN: London helicopter crash prompts safety questions

Prof Wendy Barclay, from Imperial College London, said it was wise to keep a close eye on the virus.

BBC: Health

In search of profitable opportunities, Bridgewater buys and sells more than a hundred different financial instruments around the world from Japanese bonds to copper futures traded in London to Brazilian currency contracts which explains why it keeps a close eye on Greece.

NEWYORKER: Mastering the Machine