Major infectious diseases:
degree of risk: very high food or waterborne diseases: bacterial and protozoal diarrhea, hepatitis A, and typhoid fever vectorborne diseases: malaria and yellow fever water contact disease: schistosomiasis aerosolized dust or soil contact disease: Lassa fever (2008)
Nationality:
noun: Sierra Leonean(s) adjective: Sierra Leonean
Ethnic groups:
20 African ethnic groups 90% (Temne 30%, Mende 30%, other 30%), Creole (Krio) 10% (descendants of freed Jamaican slaves who were settled in the Freetown area in the late-18th century), refugees from Liberia's recent civil war, small numbers of Europeans, Lebanese, Pakistanis, and Indians
Religions:
Muslim 60%, Christian 10%, indigenous beliefs 30%
Languages:
English (official, regular use limited to literate minority), Mende (principal vernacular in the south), Temne (principal vernacular in the north), Krio (English-based Creole, spoken by the descendants of freed Jamaican slaves who were settled in the Freetown area, a lingua franca and a first language for 10% of the population but understood by 95%)