Catherine as for the two american missionary workers being treated for ebola the news about the First American being treated on u. S. Soil is encouraging. Catherine doctor kent brantly has been treated with an experimental serum called zmapp. And is said to be improving. Catherine over the weekend. He was brought to Emory University hospital. And everyone was happy to see that he was able to walk into the hospital from an ambulance. Doctors say the serum hadnt even been tested on humans before. But theyre cautiously optimistic. Catherine a special plane has arrived in liberia to bring home the second american missionary with ebola. Catherine Nancy Writebol is expected to arrive tomorrow in atlanta. And shes also been treated with the experimental serum. Catherine meantime the death toll in nearing 900. That new serum wont be of much help because at this point, there are only a few reporter ebola is a virus that is not highly contagius. But once someones infected. Its extremely dangerou