The global Ebola epidemic—which has killed more than 11,300 people since 2013—is thought to have started in Guinea, a country in West Africa that neighbors Sierra Leone, whose outbreak the World Health Organization (WHO) declared over on Thursday.
It is not yet clear how the new patients contracted Ebola, but the WHO has warned that Ebola could resurface and said earlier that rigorous hygiene practices and emergency response systems need to be maintained, according to the news service.
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