Nowai Korkoyah, the mother of Thomas Eric Duncan, the first patient diagnosed with Ebola on U.S. soil, attends a news conference with Reverend Jesse Jackson (R) in Dallas, Texas October 7, 2014. Duncan remains in critical condition, he is on a ventilator and receiving kidney dialysis, the Dallas hospital treating him said on Tuesday. At left is Duncan's nephew Josephus Weeks. REUTERS/Jim Young 

Nowai Korkoyah, the mother of Thomas Eric Duncan, the first patient diagnosed with Ebola on U.S. soil, holds hands with Reverend Jesse Jackson in Dallas, Texas October 7, 2014. Duncan remains in critical condition, he is on a ventilator and receiving kidney dialysis, the Dallas hospital treating him said on Tuesday. REUTERS/Jim Young 

(L to R) Steve Oriabure, Eric Williams, a candidate for US Congress district 30, and Dr. Richard Nwachukwu hold a prayer vigil at The Ivy Apartments following the death of Liberian national Thomas Eric Duncan from Ebola, in Dallas, Texas October 8, 2014. Duncan, the first person diagnosed with Ebola in the United States, died Wednesday morning, a hospital spokesman said. He had been staying at the Ivy Apartments before being admitted to hospital. REUTERS/Brandon Wade 

Texas Health Presbyterian hospital, where Ebola victim Thomas Eric Duncan was admitted, is seen in Dallas, Texas October 8, 2014. The first person diagnosed with Ebola in the United States, Liberian national Duncan, died Wednesday morning, a hospital spokesman said. REUTERS/Brandon Wade 

Neighboring people watch a man in a hazardous material suit work on cleaning the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 6, 2014. Thomas Eric Duncan, the first person to develop Ebola in the United States, was struggling to survive at a Dallas hospital heightening concerns of the worst Ebola epidemic on record and has killed more than 3,400 people. REUTERS/Jim Young 

A worker in a hazardous material suit removes the contents of the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 6, 2014. Thomas Eric Duncan, the first person to develop Ebola in the United States, was struggling to survive at a Dallas hospital heightening concerns of the worst Ebola epidemic on record and has killed more than 3,400 people. REUTERS/Jim Young 

A worker in a hazardous material suit removes the contents of the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 6, 2014. Thomas Eric Duncan, the first person to develop Ebola in the United States, was struggling to survive at a Dallas hospital heightening concerns of the worst Ebola epidemic on record and has killed more than 3,400 people. REUTERS/Jim Young 

Workers in hazardous material suits clean up after removing the contents of the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 6, 2014. Thomas Eric Duncan, the first person to develop Ebola in the United States, was struggling to survive at a Dallas hospital heightening concerns of the worst Ebola epidemic on record and has killed more than 3,400 people. REUTERS/Jim Young 

A worker in a hazardous material suit looks out from the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 5, 2014. Thomas Eric Duncan, the first person diagnosed with Ebola in the United States, was fighting for his life at a Dallas hospital on Sunday and appeared not to be receiving any of the experimental medicines for the virus, a top U.S. medical official said. REUTERS/Jim Young 

A person peeks out from within the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 3, 2014. REUTERS/Jim Young 

A man passes a bag, delivered by the Red Cross and the North Texas Food Bank, in to the apartment unit at The Ivy Apartments complex where a man diagnosed with the Ebola virus was staying in Dallas, October 2, 2014.

REUTERS/Mike Stone 

A hand can be seen holding a thermometer at The Ivy Apartments where a man diagnosed with the Ebola virus was staying in Dallas, Texas October 2, 2014. REUTERS/Mike Stone 

Students disembark from a school bus outside The Ivy Apartments, where a man diagnosed with the Ebola virus was staying in Dallas, October 1, 2014. REUTERS/Mike Stone 

A general view of The Ivy Apartments in Dallas, October 1, 2014. REUTERS/Mike Stone 

A general view of Texas Health Presbyterian Hospital in Dallas, October 1, 2014. REUTERS/Mike Stone