LAGOS, NIGERIA - JULY 19: British Prime Minister David Cameron chats to nurses as he tours a GAVI Alliance vaccine and immunisation clinic where children are being immunised against yellow fever, ... more 
LAGOS, NIGERIA - JULY 19: British Prime Minister David Cameron chats to nurses as he tours a GAVI Alliance vaccine and immunisation clinic where children are being immunised against yellow fever, paid for by the British Government on July 19, 2011 in Lagos, Nigeria. The Prime Minister is on the second of a two day visit to South Africa and Nigeria accompanied by Development Secretary Andrew Mitchell, Investment Minister Lord Green and a business delegation comprising 25 representatives of blue chip British companies. Nigeria is the UK's second largest export market in Africa and the continents third largest importing nation into the UK. (Photo by Christopher Furlong - Pool/Getty Images) less 
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Getty Images | Photo By Christopher Furlong / Getty Images
Tue, Jul 19, 2011 4:47 AM EDT