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Sierra Leon’s government on Saturday announced that more than 100 people had been quarantined due to the re-spreading of Ebola, just as the country seemed to have overcome the epidemic, sources said.

The spatial epidemic spread again after people came into contact with the latest Ebola victim in the country last week, just after the World Health Organization (WHO) announced that the active transmission of the virus had ended.

Mariatu Jalloh, a 22-year-old student, died of Ebola on January 12 in the Tonkolli district of northern Sierra Leone. According to Reuters, Jalloh lived in a house with 22 occupants during her period of infection, and that five people were involved in washing her corpse—an act identified by the WHO as one of the primary modes of Ebola transmission. WHO warned of possible flare-ups as survivors can carry the virus for months.

Sources said that Jalloh had traveled near to Kambia, close to the border with Guinea, an area which was one of the last to be cleared of the virus before Sierra Leone was declared Ebola-free on November 7, 2015, yet this has not been identified as the ultimate source of transmission.

“109 people have been quarantined, with 28 considered to be high-risk cases,” said Sierra Leone’s Ministry of Health and the Office of National Security, adding that “investigations are ongoing in four districts where Jalloh was known to have traveled.”

In apparent frustration at the latest case, the homes of some high risk patients were attacked this weekend in Magburaka, the city about 200 km (120 miles) east of Freetown where Jalloh died, and in one case a hut was burned down, according to a local leader. Moreover, demonstrators last week accused the health department of negligence at a local hospital that saw Jalloh as an outpatient before she died.

Reuters said that according to a health report, Jalloh’s death has concerned health experts because authorities failed to follow basic protocols.

Around 11,300 people have died in Sierra Leone, Guinea and Liberia in the current outbreak which was a blow for the African countries that started in March 2014. Guinea was declared free of active transmission of Ebola on December 29, 2015, while Liberia achieved the status for the third time on Thursday.

The incubation period, that is, the time interval from infection with the virus to onset of symptoms is 2 to 21 days, after which an area can be declared as disease-free.

Ebola virus disease(EVD), formerly known as Ebola haemorrhagic fever, is a severe, often fatal illness in humans. The virus is transmitted to people from wild animals and spreads in the human population through human-to-human transmission. The average EVD case fatality rate is around 50%. Case fatality rates have varied from 25% to 90% in past outbreaks.

Ebola virus disease (EVD) first appeared in 1976 in 2 simultaneous outbreaks, one in what is now, Nzara, South Sudan, and the other in Yambuku, Democratic Republic of Congo. The latter occurred in a village near the Ebola River, from which the disease takes its name.