The World Health Organization has declared the West African region fee from Ebola. Yahoo News reports that on Thursday, the WHO declared Liberia free of the Ebola virus by global health experts.

This means the Ebola epidemic in West Africa which took the lives of 11,300 people. Liberia was the last affected country to get the all-clear signal, with no cases of Ebola for 42 days, twice the length of the virus’s “incubation period” – the time elapsed between transmission of the disease and the appearance of symptoms.

However, the BBC reported that the WHO warns West Africa may see flare-ups of the virus. Also, the organization says that Liberia, Sierra Leone and Guinea “remain at high risk of additional small outbreaks” of Ebola.

WHO chief, Margaret Chan believes the landmark achievement by the West African region is a contributory effort.

“All known chains of transmission have been stopped in West Africa”, with no cases reported for at least 42 days in Liberia, Guinea and Sierra Leone, the three states hardest-hit by the outbreak. So much was needed and so much was accomplished by national authorities, heroic health workers, civil society, local and international organizations and generous partners,” Chan said.