Africa

cnn.com - by By Jacque Wilson and Danielle Dellorto - August 5, 2014

(CNN) -- Two American missionary workers infected with the deadly Ebola virus were given an experimental drug that seems to have saved their lives.

Dr. Kent Brantly was given the medication, ZMapp, shortly after telling his doctors he thought he would die, according to a source familiar with his case. Within an hour, doctors say his symptoms -- labored breathing and a widespread rash -- dramatically improved. Nancy Writebol, another missionary working with Samaritan's Purse, received two doses of the medication and has also shown significant improvement, sources say.

As there is no proven treatment and no vaccine for Ebola, this experimental drug is raising lots of questions.

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Three top secret, experimental vials stored at subzero temperatures were flown into Liberia last week in a last-ditch effort to save two American missionary workers who had contracted Ebola, according to a source familiar with details of the treatment.

On July 22, Dr. Kent Brantly woke up feeling feverish. Fearing the worst, Brantly immediately isolated himself. Nancy Writebol's symptoms started three days later. A rapid field blood test confirmed the infection in both of them after they had become ill with fever, vomiting and diarrhea.

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As West African nations try to stop the deadly Ebola virus from spreading, people living in the affected countries are nervous. In Sierra Leone, communities are keeping a close eye on the exact locations where the disease has emerged.

The posters are crudely drawn and graphic. There's one pasted to the wall of the squat, concrete community centre in Kroo Bay, a slum in the centre of the capital Freetown, the kind of place where you can imagine disease spreading fast.

The houses are built of breeze block and have battered, rusting roofs. The spaces between them are piled with garbage, small children with no shoes tote yellow plastic jerry cans of water through the narrow lanes.