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Second American infected with Ebola

By Joe Sutton and Holly Yan, CNN
August 22, 2014 -- Updated 1955 GMT (0355 HKT)
STORY HIGHLIGHTS
  • NEW: Aid worker Nancy Writebol becomes second American infected
  • Dr. Kent Brantly is ill after treating Ebola patients in Liberia last week
  • The current outbreak of Ebola virus is the deadliest ever, health officials say
  • A doctor working on the Ebola outbreak in Sierra Leone is also infected

(CNN) -- A second American aid worker in Liberia has tested positive for Ebola, according to the Christian humanitarian group she works for.

Nancy Writebol is employed by Serving in Mission, or SIM, in Liberia and was helping the joint SIM/Samaritan's Purse team that is treating Ebola patients in Monrovia, according to a Samaritan's Purse statement.

Worst Ebola outbreak in history
Nancy Writebol
Nancy Writebol

Writebol, who serves as SIM's personnel coordinator, has been living in Monrovia with her husband, David, according to SIM's website. The Charlotte, North Carolina, residents have been in Liberia since August 2013, according to the blog Writebols2Liberia. They have two adult children.

On Saturday, Samaritan's Purse announced that American doctor Kent Brantly had become infected. The 33-year-old former Indianapolis resident had been treating Ebola patients in Monrovia and started feeling ill, spokeswoman Melissa Strickland said. Once he started noticing the symptoms last week, Brantly isolated himself.

Brantly, the medical director for Samaritan Purse's Ebola Consolidated Case Management Center in Monrovia, has been in the country since October, Strickland said.

"When the Ebola outbreak hit, he took on responsibilities with our Ebola direct clinical treatment response, but he was serving in a missionary hospital in Liberia prior to his work with Ebola patients," she said.

Deadliest Ebola outbreak

Health officials say the Ebola outbreak, centered in West Africa, is the deadliest ever.

As of July 20, some 1,093 people in Guinea, Sierra Leone and Liberia are thought to have been infected by Ebola since its symptoms were first observed four months ago, according to the World Health Organization.

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Testing confirmed the Ebola virus in 786 of those cases; 442 of those people died.

Of the 1,093 confirmed, probable and suspected cases, 660 people have died.

There also are fears the virus could spread to Africa's most populous country, Nigeria.

Last week, a Liberian man hospitalized with Ebola in Lagos died, Nigerian Health Minister Onyebuchi Chukwu said.

Lagos, the largest city in Nigeria, has a population of more than 20 million.

The man arrived at Lagos airport on July 20 and was isolated in a local hospital after showing symptoms associated with the virus. He told officials he had no direct contact with anyone with the virus nor had he attended the burial of anyone who died of Ebola.

Another doctor infected

Confirmation of the death in Lagos came after news that a doctor who has played a key role in fighting the Ebola outbreak in Sierra Leone is infected with the disease, according to that country's Ministry of Health.

Dr. Sheik Humarr Khan is being treated by the French aid group Medecins Sans Frontieres -- also known as Doctors Without Borders -- in Kailahun, Sierra Leone, agency spokesman Tim Shenk said.

Before falling ill, Khan had been overseeing Ebola treatment and isolation units at Kenema Government Hospital, about 185 miles east of the capital, Freetown.

Ebola typically kills 90% of those infected, but the death rate in this outbreak has dropped to roughly 60% because of early treatment.

What is Ebola, and why does it kill?

Spread by bodily fluids

Officials believe the Ebola outbreak has taken such a strong hold in West Africa because of the proximity of the jungle -- where the virus originated -- to Conakry, Guinea, which has a population of 2 million.

Because symptoms don't immediately appear, the virus can easily spread as people travel around the region. Once infected with the virus, many people die in an average of 10 days as the blood fails to clot and hemorrhaging occurs.

The disease isn't contagious until symptoms appear. Symptoms include fever, headache and fatigue. At that point, the Ebola virus is spread via bodily fluids.

Get the fast facts on Ebola

Health workers are at especially high risk, because they are in close contact with infected people and their bodily fluids. Adding to the danger, doctors may mistake the initial stages of an Ebola infection for another, milder illness.

Deadliest outbreak ever: What you need to know

Is it time to text experimental vaccines?

Why the epidemic is spinning out of control

I survived Ebola

CNN's Jeremy Grisham, Carma Hassan, Laura Smith-Spark and journalist Aminu Abubakar in Nigeria contributed to this report.

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