Two US aid workers stricken with the deadly Ebola virus are now said to be improving.
Dr Kent Brantly and missionary Nancy Writebol each received an experimental drug for Ebola.
It's called ZMapp and it's only been tested on monkeys until now.
They're in the same isolation ward at Emory University Hospital in Atlanta.
The drug is so experimental, Brantly and Writbol are the only cases of Ebola authorized to it.
Dr Fauci thinks it's too soon to tell if the drug will lead to a cure.