One of the chronic problems the international community has with almost every disease-fighting campaign has been the need to overcome mistrust — mistrust of government, of foreign health workers or outsider do-gooders in general.
This is, for a variety of reasons, especially true of vaccines.
So many worry that such global health efforts will suffer from the revelation, reported first in The Guardian and later by the New York Times and others, that the Central Intelligence Agency (CIA) set up a fake vaccination program in Pakistan in order to collect DNA samples.