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(CNN) – The organization Médecins Sans Frontières (Doctors Without Borders) reports that a Norwegian staff member has contracted Ebola. The staffer had been working in Sierra Leone and was placed in isolation Sunday after developing a fever, the organization said.
The news comes as aid groups face growing difficulties recruiting workers to fight the deadly Ebola outbreak.
"The resistance you get is not just personal fear, but also my mother wouldn't want me to go, my son wouldn't want me to go, my family wouldn't want me to go, so on. And so you have a big resistance to people leaving," said Dr. Alexander van Tulleken, an infectious disease expert and professor at Fordham University.
There are "huge human resources problems getting staff (to West Africa)," he said.
Doctors, nurses, and aid workers on the front lines of the outbreak are working extremely long hours, and in sweltering conditions.
Health care workers are contracting the virus "because they are working 20-hour shifts. It's because inside their suits it's 115 degrees," said van Tulleken. "It's so easy to wipe a brow with an infected hand it's so easy to get something in your mouth and not follow protocol because you're exhausted and you're frightened."
For more of our interview with Dr. Alexander van Tulleken, check out the video above.