A doctor who contracted Ebola while offering aid in Liberia arrived on Friday at Nebraska Medical Center in Omaha to receive treatment for the disease that is ravaging West Africa.

Rick Sacra is the third American aid worker to be infected with the Ebola virus in Liberia and will be attended to at the hospital's 10-bed special isolation unit, which is the largest such unit in the U.S., according to USA Today.

The 51-year-old Sacra traveled to Liberia to help after hearing about the two previous Americans that were forced to leave after contracting Ebola. Sacra was working in a maternity ward - not treating Ebola patients - so it remains unclear how he caught the virus.

The two other Americans who were infected with Ebola, Dr. Kent Brantly and Nancy Writebol, were treated in Atlanta and both have recovered.

Dr. Phil Smith, director of the Nebraska hospital's isolation unit, said a team of 35 doctors, nurses and other medical professionals will be on hand to treat Sacra, making sure to fight dehydration and maintaining his vitals.

No licensed drug or vaccines exist to treat Ebola, though there are a number of experimental drugs that could be used. Sacra's care team has not chosen a specific treatment for him, but likely will in the coming days.

Smith said that Sacra is in stable condition and was able to get on the plane that flew him to Omaha under his own power.

While, Sacra will be expected to make a full recovery, Ebola continues to spread in West Africa, where it kills about 50 percent of those infected. The worst Ebola outbreak in recorded history started in Guinea in March and has since spread to four other countries in the region, killing more than 1,900 people.

The World Health Organization has said in recent days that Ebola could eventually infect more than 20,000 people before it is under control, according to The Wall Street Journal.