David Sterman

So far in 2014, there have been 20 attacks on polio workers in Pakistan that have killed 32 people, according to data I collected using news reports; and the attacks are only escalating in lethality and violence. In 2013, there were 29 attacks against polio workers, killing 22 people; and in 2012, there were only nine attacks that resulted in the deaths of 10 people.