Did the killing of Osama bin Laden have an unintended victim: the global drive to eradicate polio?

In Pakistan, where polio has never been eliminated, the C.I.A.’s decision to send a vaccination team into the Bin Laden compound to gather information and DNA samples clearly hurt the national polio drive. The question is: How badly?

After the ruse by Dr. Shakil Afridi was revealed by a British newspaper a year ago, angry villagers, especially in the lawless tribal areas on the Afghan border, chased off legitimate vaccinators, accusing them of being spies.

And then, late last month, Taliban commanders in two districts banned polio vaccination teams, saying they could not operate until the United States ended its drone strikes. One cited Dr. Afridi, who is serving a 33-year sentence imposed by a tribal court, as an example of how the C.I.A. could use the campaign to cover espionage.

“It was a setback, no doubt,” conceded Dr. Elias Durry, the World Health Organization’s polio coordinator for Pakistan. “But unless it spreads or is a very longtime affair, the program is not going to be seriously affected.”