A senior White House official has said the CIA will no longer use vaccination programmes as a cover for spying operations.
The decision comes after complaints from American medical professionals about the agency's use of a public health programme in Pakistan in its hunt for Osama bin Laden.
In 2011, the CIA attempted to obtain DNA samples of children they believed to be related to bin Laden through a hepatitis vaccination campaign.
Since then, the Pakistani Taliban have targeted polio vaccination campaigns, saying they believe they are a front for spying.
