In capturing and executing Osama Bin Laden the CIA exploited a vaccination campaign. I believe this would be a war crime because it is a war crime to camoflauge yourself as a health worker in war. Naturally this puts future doctors working in battlefields at risk. They might be suspected of doing more than helping the wounded. This in turn is a threat to all soldiers in battle, who now are more difficult to aid.
In the case of polio in Pakistan this clearly harmed efforts to eradicate this disease. This is not at all unexpected. Chomsky discussed the likelihood of this immediately following the raid, quoting health experts that said this could produce 100,000 additional cases of polio. How would you feel if your child contracted polio subsequent to this action in Pakistan? Who would you blame?
Today we have the news of vaccination workers being gunned down in Pakistan. We still don't have word from the CIA if their use of the polio vaccination program was helpful in finding Bin Laden.