When Esperance Nzavaki heard she was cured of Ebola after three weeks of cutting-edge care at a medical center in eastern Congo, she raised her arms to the sky with joy and praised the Lord.

Her recovery is testament to the effectiveness of a new treatment, which isolates patients in futuristic cube-shaped mobile units with transparent walls and gloved access, so health workers no longer need to don cumbersome protective gear.

"I started to feel sick, with a fever and pain all over my body. I thought it was typhoid. I took medicine but it didn't work," Nzavaki said in Beni, a city of several hundred thousand, where officials are racing to contain the virus.