March 24 - An outbreak of Ebola virus which has killed at least 59 people in Guinea continues its spread, entering Liberia and threatens to spread to Sierra Leone.
March 31 - The Ebola outbreak is reported to have made several cases in Sierra Leone.[1]
May
May 26 - WHO reports the first cases and deaths of Ebola in Sierra Leone, in Kailahun District.[2][3]
June 6 - The World Health Organization estimates that an outbreak of the Ebola virus has killed more than 200 people in West Africa.
June 11 - Sierra Leone closed its borders with Liberia and Guinea and closed a number of schools around the country.[4] On 30 July, the government began to deploy troops to enforce quarantines.[5]
The World Health Organization announces a US$100 million emergency response plan to combat the outbreak, which has killed at least 729 people.
The Peace Corps withdraws all volunteers from Liberia, Sierra Leone and Guinea, citing Ebola risks.[13]
August
August 1 - Liberia and Sierra Leone declare a state of emergency in response to the Ebola virus disease by sending in troops and ordering the closure of schools and markets and the quarantining of affected communities.
August 4 - The World Health Organization estimates that the death toll from the Ebola virus outbreak has risen to 887.
August 6 - The World Health Organization reports that 932 have died from the latest outbreak of the Ebola virus with a man reportedly dying of the disease in Jeddah, Saudi Arabia after a business trip to Sierra Leone.
October
October 14 - 800 Sierra Leone peacekeepers due to relieve a contingent deployed in Somalia were placed under quarantine when one of the soldiers tested positive for Ebola.[14]
October 16 - The Emergency Operations Center announced two Ebola cases in the Koinadugu district in the far north. This marks the arrival of cases in every district in the country.[15]
October 21 - Riots broke out in the Kono district to prevent the quarantine of a 90-year-old woman suspected of having EVD; the youths are reportedly angry that there are no treatment centers in the diamond-rich Kono district. A daytime curfew is imposed.[16]