Atlanta (CNN) -- A Nigerian doctor has been diagnosed with Ebola nearly three weeks after a Liberian-American man with Ebola died after traveling to Lagos, Nigerian officials said Monday.
Nigerian Minister of Health Onyebuchi Chukwu told reporters that the infected physician had been treating Patrick Sawyer, a top government official in the Liberian Ministry of Finance who died of Ebola in a Nigerian hospital July 20.
Eight other people are being quarantined and three are awaiting Ebola test results, the health minister said.
Read more about Patrick Sawyer's death (http://www.theinfostride.com/forum/'http://www.cnn.com/2014/07/29/health/ebola-outbreak-american-dies/')
(http://i.cdn.turner.com/cnn/.e/img/3.0/mosaic/bttn_close.gif) (http://i2.cdn.turner.com/cnn/dam/assets/140803112622-ebola-transport-team-speaks-to-cnn-00001906-story-top.jpg)Ebola transport team speaks to CNN
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Dr. Kent Brantly, right, gets out of an ambulance after arriving at Emory University Hospital in Atlanta on Saturday, August 2. Brantly was infected with the Ebola virus in Africa but was brought back to the U.S. for further treatment. Health officials say the Ebola outbreak centered in West Africa is the deadliest ever. The World Health Organization reports that the outbreak in Liberia, Sierra Leone and Guinea has infected more than 1,300 people and killed more than 700 this year.
Nurses wearing protective clothing are sprayed with disinfectant on Friday, August 1, after preparing the bodies of several Ebola victims for burial in the isolation unit of the ELWA Hospital in Monrovia, Liberia.
A nurse disinfects the waiting area at the ELWA Hospital in Monrovia, Liberia, on Monday, July 28.
Liberian President Ellen Johnson Sirleaf, right, walks past an Ebola awareness poster in downtown Monrovia as Liberia marked the 167th anniversary of its independence Saturday, July 26. The Liberian government dedicated the anniversary to fighting the deadly disease.
In this photo provided by Samaritan's Purse, Dr. Kent Brantly, left, treats an Ebola patient in Monrovia. On July 26, the North Carolina-based group said Brantly tested positive for the disease. On Saturday, August 2, Brantly arrived by specially equipped plane in Georgia to be treated at an Atlanta hospital, becoming the first Ebola patient to knowingly be treated in the United States.
A 10-year-old boy whose mother was killed by the Ebola virus walks with a doctor from the aid organization Samaritan's Purse after being taken out of quarantine Thursday, July 24, in Monrovia.
A doctor puts on protective gear at the treatment center in Kailahun, Sierra Leone, on Sunday, July 20.
Doctors Without Borders staff members adjust tents in the isolation area in Kailahun, Sierra Leone, on July 20.
Boots dry in the Ebola treatment center in Kailahun, Sierra Leone, on July 20.
Red Cross volunteers prepare to enter a house where an Ebola victim died in Pendembu, Sierra Leone, on Friday, July 18.
Dr. Jose Rovira, of the World Health Organization, takes a swab from a suspected Ebola victim in the town of Pendembu, Sierra Leone, on July 18.
Red Cross volunteers disinfect each other with chlorine after removing the body of an Ebola victim from a house in Pendembu, Sierra Leone, on July 18.
A dressing assistant prepares a member of Doctors Without Borders to enter an isolation ward on Thursday, July 17.
A doctor works in the field laboratory at the Ebola treatment center in Kailahun, Sierra Leone, on July 17.
Doctors Without Borders staff prepare to enter the isolation ward at an Ebola treatment center in Kailahun, Sierra Leone, on July 17.
A health worker with disinfectant spray walks down a street outside the government hospital in Kenema, Sierra Leone, on Thursday, July 10.
Dr. Mohamed Vandi, from the Kenema Government Hospital, trains community volunteers who will aim to educate people about Ebola in Sierra Leone, on July 10.
Police block a road outside the town of Kenema, Sierra Leone, on Wednesday, July 9, in order to stop motorists for a body temperature check.
A woman has her temperature taken at a screening checkpoint on the road out of Kenema, Sierra Leone, on July 9.
A member of Doctors Without Borders puts on protective gear at the isolation ward of the Donka Hospital in Conakry, Guinea, on Saturday, June 28.
Airport employees check passengers in Conakry before they leave the country on Thursday, April 10.
CNN's Dr. Sanjay Gupta, left, works in the World Health Organization's mobile lab in Conakry. Gupta traveled to Guinea in April to report on the deadly virus.
A Guinea-Bissau customs official watches arrivals from Conakry on Tuesday, April 8.
Egidia Almeida, a nurse in Guinea-Bissau, scans a Guinean citizen coming from Conakry on April 8.
A scientist separates blood cells from plasma cells to isolate any Ebola RNA and test for the virus Thursday, April 3, at the European Mobile Laboratory in Gueckedou, Guinea.
Members of Doctors Without Borders carry a dead body in Gueckedou on Friday, April 1.
Gloves and boots used by medical personnel dry in the sun April 1 outside a center for Ebola victims in Gueckedou.
A health specialist works Monday, March 31, in a tent laboratory set up at a Doctors Without Borders facility in southern Guinea.
Health specialists work March 31 at an isolation ward for patients at the facility in southern Guinea.
Workers associated with Doctors Without Borders prepare isolation and treatment areas Friday, March 28, in Guinea.
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(http://i2.cdn.turner.com/cnn/dam/assets/140804090925-02-kent-brantly-arrives-0804-horizontal-gallery.jpg) Photos: Ebola outbreak in West Africa
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(http://i2.cdn.turner.com/cnn/dam/assets/140731100238-ebola-virus-map-updated-story-top.jpg)Map: The Ebola outbreak
Meanwhile, the World Health Organization (http://www.theinfostride.com/forum/'http://www.who.int/csr/don/2014_07_31_ebola/en/') reports an outbreak of the virus in Liberia, Sierra Leone, Guinea and Nigeria is believed to have infected 1,440 people and killed more than 826 this year.
The United States is planning to send 50 health experts to West Africa to help contain the outbreak.
"This is the biggest and most complex Ebola outbreak in history," CDC Director Dr. Tom Frieden said in a statement. (http://www.theinfostride.com/forum/'http://www.cdc.gov/media/releases/2014/p0731-ebola.html')
"It will take many months, and it won't be easy, but Ebola can be stopped. We know what needs to be done," he said.
Frieden said the 50 experts from the CDC will work to combat the outbreak and help implement stronger systems to fight the disease.
The Ebola virus causes viral hemorrhagic fever, which affects multiple organ systems in the body and is often accompanied by bleeding.
Early symptoms include sudden onset of fever, weakness, muscle pain, headaches and a sore throat. They later progress to vomiting, diarrhea, impaired kidney and liver function -- and sometimes internal and external bleeding.
The United States had not treated an Ebola patient until last week, but the CDC has spearheaded efforts to prepare for the deadly virus.
It helped create an isolation unit at Emory University Hospital, which is being used to treat American doctor Kent Brantly (http://www.theinfostride.com/forum/'http://www.cnn.com/2014/08/02/health/ebola-kent-brantly/index.html'), who contracted Ebola in Liberia and was evacuated to the facility in Atlanta over the weekend.
A second American patient, Nancy Writebol (http://www.theinfostride.com/forum/'http://www.cnn.com/2014/08/02/health/ebola-nancy-writebol/index.html'), is scheduled to arrive from Liberia on Tuesday. She will undergo treatment at the same unit.
Emory is one of four U.S. institutions capable of providing such treatment.
But in the nations hardest-hit and not as prepared, the reality is grim. Even in the best-case scenario, it could take three to six months to stem the epidemic in West Africa, Frieden said.
Ebola spreads through contact with organs and bodily fluids such as blood, saliva, urine and other secretions of infected people. It has no cure. The most common treatment requires supporting organ functions and maintaining bodily fluids such as blood and water long enough for the body to fight off the infection.
So far, the outbreak has been confined to West Africa.
Ebola also claimed the life of a medical director at a hospital in Liberia's capital, Monrovia. Dr. Patrick Nshamdze tested positive Tuesday after being sick for two weeks. He died Saturday.
In Sierra Leone, where government officials have asked citizens to stay away from work, the military has deployed at least 750 medical officials to 13 locations, military spokesman Col. Michael Samura said.
Health officials are screening incoming and outgoing passengers at the country's main international airport with a device that takes people's temperature from their eyes at a distance.
Anyone showing signs of fever is quarantined and their blooded in tested.
What is the risk of catching Ebola on a plane? (http://www.theinfostride.com/forum/'http://cnn.com/2014/07/31/travel/ebola-planes-air-travel/index.html')
Experts: U.S. health care system well-prepared for Ebola (http://www.theinfostride.com/forum/'http://cnn.com/2014/07/31/health/ebola-isolation-treatment/index.html')
Ebola's frontline: Battling fear and deadly virus (http://www.theinfostride.com/forum/'http://cnn.com/2014/08/01/opinion/ebola-sierra-leone-doctor/index.html')
CNN's David McKenzie contributed to this report from Freetown, Sierra Leone. Journalist Heather Murdock reported from Nigeria. CNN's Nana Karikari-apau and Christabelle Fombu contributed to this report.
Source: CNN