Figure 5
From: The roles of water, sanitation and hygiene in reducing schistosomiasis: a review
A world map of the 138 primary field studies cited in this review. The remaining 81 papers, being reviews, laboratory studies and commentaries, are not displayed on this map. Note that (i) South Sudan and Sudan are shown together since the studies from this region were all conducted before South Sudan became independent in 2011, (ii) Zanzibar is counted as a part of Tanzania, and (iii) studies’ countries were mutually exclusive but their topics of study (i.e. water supplies, sanitation and hygiene) were not.