WHO: Ebola outbreak one of ‘most challenging’

Story highlights

Mali says it has three suspected Ebola cases

Ebola has sickened 178 people, killed more than 100, WHO says

More deaths are suspected or confirmed in Sierra Leone, Mali

CNN —  

A total of 142 deaths have been reported from the Ebola outbreak in Guinea and Liberia, the World Health Organization said.

Nineteen suspected cases reported in Sierra Leone tested negative for the virus, it said.

The number of suspected cases in Guinea has grown to 157, with 101 deaths. Sixty-seven have been confirmed as Ebola. In Liberia, 21 cases have been reported, including 10 deaths. Five of the cases have been confirmed as Ebola.

The outbreak has “rapidly evolved” since originating in the forests of southeastern Guinea. The city of Guekedou, near the borders with Sierra Leone and Liberia, has seen the majority of the deaths.

Five people are believed to have died in Guinea’s capital, Conakry, according to WHO. Two of the victims had traveled to the region.

“This is one of the most challenging Ebola outbreaks that we have ever faced,” said Dr. Keiji Fukuda, WHO’s assistant director-general for health security.

What is Ebola and why does it kill?

It’s the first emergence of Ebola in western Africa, and WHO spokesman Tarik Jasarevic said the U.N. agency is trying to track people who had encountered the victims and make sure “that all those who have been in contact with infected people are being checked upon.”

The U.N. agency is trying to track people who had encountered the victims and make sure “that all those who have been in contact with infected people are being checked upon,” spokesman Tarik Jasarevic told CNN last week.

There are about 50 staff currently deployed in the area and more are set to go shortly. They are working to prevent the spread of infection, primarily in health care facilities, and are sending personal protective equipment to surrounding countries.

“What is really important is to inform the population of Guinea and Conakry about this disease, as this is the first time they are facing Ebola. They need to know what it is and how they can protect themselves.”

In Liberia, seven Ebola deaths have been confirmed out of 14 suspected cases. Sierra Leone is investigating at least two deaths. The aid organization Doctors Without Borders has called the outbreak unprecedented, because previous cases have been limited to a small area.

Mali’s government reported on its Facebook page on Thursday that biological samples tied to three suspected Ebola cases within its borders are being sent to the U.S. Centers for Disease Control and Prevention for analysis.

Ebola is one of the world’s deadliest viruses, causing a hemorrhagic fever that kills up to 90% of those infected. It spreads in the blood and shuts down the immune system, causing high fever, headache and muscle pain, often accompanied by bleeding.

Close to 9 in 10 of the patients WHO health professionals are seeing with Ebola are dying, said Dr, Stephane Hugonnet, who returned from southeast Guinea last weekend.

“Ebola is clearly a severe disease,” Fukuda said. “It is also an infection that can be controlled. … We know very well how this virus is transmitted.”

Why does it kill?

CNN’s Miriam Falco, Jacque Wilson, Matt Smith and Anna Maja Rappard contributed to this report.