Pakistan is currently at the center of the global effort to eradicate polio. Although the country has reported only about a hundred cases this year, that's more cases than in all other nations combined.
Eliminating the paralyzing disease is a major logistical operation in Pakistan. More than 200,000 vaccinators fan out across the country, several times a year, to inoculate millions of children. The government also deploys tens of thousands of armed security forces to guard the workers.
A doctor trained in Fort Worth, Texas, is now a victim of the Ebola outbreak he was battling.
Kent Brantly, 33, had been caring for Ebola patients in Liberia's capital, Monrovia, for several months when he noticed he had symptoms of the deadly virus last Wednesday.
He immediately put himself into an isolation ward.
"He is still conversing and is in isolation. But he is seriously ill with a very grave prognosis," says Dr. David McRay, of John Peter Smith Hospital in Fort Worth, who spoke to Brantly by phone on Monday.