The declaration will allow more health workers and resources to circulate in the affected area in the hope of containing the disease.
But this is a decision that must be fulfilled, according to the expert of a department of health security of the University of Sydney, Adam Kamradt-Scott.
"It is the consensus of a good proportion of the international health community that should have been declared a public health emergency months ago," he told 9news.com.au.
"It is a long awaited decision, and the way they justify it now is that it has appeared in Goma."
Goma is a city of the size of Brisbane, which is on the border with Rwanda and has an international airport.
Previously, the disease had been more or less contained in certain regions of the Democratic Republic of the Congo, but its onset in Goma has WHO authorities that fear that it may spread globally.
The outbreak is affecting the region of Beni more severely, but a shepherd from the region traveled by bus to Goma before it was indicated that he had the disease.
Ebola is known as viral haemorrhagic fever, professor of prevention and disease of infections at the University of Sydney, said Ramon Shaban.
"The infection has a lot of similarity to the flu. Headache, muscle aches, sweating, fever, cough," said Dr. Shaban
"In a proportion of patients, bleeding from the mucous membranes, from the mouth, from the eyes."
The Ebola mortality rate is 50 percent, that is, one in two people who capture it, die for it.
"If you are not healthy, if you are malnourished, it will hinder the prognosis," said Dr. Shaban
"If the patient is well, their chances of recovery are good, but if they have asthma or heart disease it is more difficult."
Ebola is a deadly disease, but in an Australian context, difficult to hire.
The virus is spread by physical contact with body fluids.
"Do not take it to someone who sneezes," Dr Shaban said.
"It is related to a high concentration of dense lives in areas with lower levels of hygiene".
The outbreak is especially difficult to control in areas with private funeral practices.
By cultural tradition, members of the family in the DRC will treat corpses of loved ones before burial.
As a result, family members are more likely to get fatal illness.
There is no cure for ebola, but many patients can recover if they give the right treatment soon.
And since the epidemic of West Africa in 2014, a vaccine has been developed.
But the methods of supportive treatment help the possibilities of recovery, said Dr. Shaban
"The interventions are supportive, but since it is a virus, there are no antibiotics," he said.
"The vaccine is an important measure, but taking into account the location of these outbreaks, access to these vaccines is limited."
What makes this outbreak so difficult to contain?
Despite its reputation as one of the poorest and chaotic countries on earth, the Democratic Republic of Congo is the most experienced in relation to Ebola.
"The Democratic Republic of the Congo has had numerous Ebola outbreaks and have experience in managing these events," said Dr. Kamradt-Scott.
What makes this outbreak more difficult for the government to control is the presence of armed rebel groups in the region.
And there is a lack of confidence in foreign and governmental health workers in the region, which hinders efforts to contain the virus.
"Some of the local communities do not believe that Ebola is real, or believe that international health workers are spreading," said Dr. Kamradt-Scott.
"There has been a massive outbreak of measles and many people die from other diseases.
"And the people who say it is saying:" Well, it did not worry that our children would die for these other diseases. Only you import this because it can affect you. "
In recent months, two health workers have been killed in the DRC, including a doctor for WHO.
Can Ebola finish in Australia?
There has never been a case of Ebola in Australia.
"The possibilities of getting there are low," said Dr. Shaban
"However, with an increase in international travel, there are risks."
It is totally possible for a person to embark on an airplane in the Democratic Republic of the Congo and land in Australia without realizing that it carries the virus.
The possibilities of spreading in Australia are tiny, though.
"Types of public health interventions are simple quarantine and isolation," said Dr. Kamradt-Scott.
"If you are in a country where there is a deficient sanitation, this increases the risk of spread of infectious diseases."
And each state has a hospital specialized in infectious diseases.
This means that if someone in Australia was sick with Ebola, they would be isolated and the virus could not be spread.
Where is the Democratic Republic of the Congo?
The Democratic Republic of the Congo has a long reputation as one of the most dysfunctional and violent countries on earth.
Seated in the center of Africa, it is geographically one of the largest nations of the Earth, approximately the same size in Western Australia.
The old Belgian colony has more than 91 million people, but each person earns on average only $ 501 a year.
The country, formerly known as Zaire, has been shaken by illness, famine and civil war for much of its existence.
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