Fig. 2.

Distribution of included samples by population category and WHO region^a.

^aSelected population groups comprised people who inject drugs, haemodialysis recipients, men who have sex with men, commercial sex workers, and people with hepatitis C virus or HIV. In sub-Saharan Africa countries with adult HIV prevalence >1%, HIV populations were included in the general population. Isolated populations were selected sample populations that were considered not representative of the general population. WHO, World Health Organisation; AFR, African Region; EMR, Eastern Mediterranean Region; EUR, European Region; AMR, Region of the Americas; SEAR, South-East Asian Region; WPR, Western Pacific Region.