The New York Times:

Three years after the Central Intelligence Agency set up a phony hepatitis vaccination program in Pakistan as part of the hunt for Osama bin Laden, the Obama administration told a group of American health educators last week that the agency no longer uses immunization programs as a cover for spying operations.

In a letter to leaders at a dozen schools of public health, President Obama’s senior counterterrorism adviser said the C.I.A. had banned the practice of making “operational use” of vaccination programs, adding that the agency would not seek to “obtain or exploit DNA or other genetic material acquired through such programs.”

Using a vaccination program to try to find bin Laden is thought to have led to the deaths of 56 immunization workers in Pakistan, and it may well be contributing to the current polio emergency (which is partly rooted in Pakistan).