The most widespread epidemic of Ebola virus disease (commonly known as "Ebola") in history began in Guinea in December 2013 and continued with significant loss of life for over two years. , although the epidemic is no longer out of control, the World Health Organization (WHO) has not yet declared the epidemic over due to the continuation of flare-ups. A flare-up on 14 January in Sierra Leone has resulted in one death, one patient being treated, and over 100 people being quarantined.