A day after the World Health Organization (WHO) announced that West Africa is Ebola-free, a young woman from Freetown, Sierra Leone was confirmed to have died of the deadly virus. A total of 109 individuals who have come in contract with the woman are under quarantine with 28 of them considered as high-risk patients, per Reuters.

Several tests results came back on Friday confirming that 22-year-old Mariatu Jalloh died of Ebola last Jan. 12. WHO officials and experts are worried of another outbreak in Sierra Leone because authorities failed to follow certain protocols in handling her corpse.

It is unknown where Jalloh contracted that disease, but she reportedly traveled near the Guinean border back in December when the area was declared free from the virus. The possibility of another outbreak prompted people to attack and burn houses of many high-risk patients as well as the hut where the woman died.

"We do not know who is behind this, but we are shocked that anyone would do this in view of what Ebola has done to our country," Paramount Chief Masakma III of Freetown said. The chief believes that people are frustrated on how their health department handled the situation.

The report added that Jalloh's dead body was washed by five people and lived in a house with 22 people while she was sick. She was also an outpatient in a local hospital before her death, which could increase the number of new cases.

In a statement by WHO, the agency is working with the Sierra Leone government in conducting an investigation to help decrease the chance of a flare-up. The country is still under a 90-day enhance surveillance period that started on Nov. 7, 2015 when Sierra Leone was free of Ebola.

"We are now at a critical period in the Ebola epidemic as we move from managing cases and patients to managing the residual risk of new infections. We still anticipate more flare-ups and must be prepared for them," WHO's Special Representative for the Ebola Response Dr. Bruce Aylward said.

According to BBC, Ebola was first discovered in 1976 and more than 11,000 people have died since the December 2013 outbreak with almost 4,000 casualties in Sierra Leone. Guinea has the most deaths with more than 4,800 while about 2,500 died in Liberia.

There were also eight reported deaths in Nigeria with more than 17,000 survivors of the viral disease in the continent. Many scientists and health experts think that there will always be a risk of the deadly Ebola virus in West Africa.