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iv decadron taper All this explains why polio is so difficult to annihilate. For every one person who actually gets sick, nearly 200 are carrying the virus and infecting others. To detect the spread of the disease in Afghanistan as soon as possible, Zahed and his colleagues have built a network for reporting suspected cases of polio-related paralysis. Since Afghanistan’s public health care system is almost nonexistent in many rural and remote areas, they’ve recruited all sorts of locals to whom parents are likely to bring a sick child: mullahs, shrine keepers, pharmacists, faith healers, and traveling quacks. They’ve been given basic training and are paid a reward of about $5 for reporting a confirmed case of paralytic polio. Moreover, advances in rapid genetic sequencing have allowed researchers to chart the path of each infection, showing the complex and often unexpected ways in which polio can travel.