<p>The 39 countries with studies generating individual participant data (IPD) suitable for estimating drug efficacy are shaded blue, with darker shades corresponding to higher estimated abundance of IPD. Five of these, with a red border, do not require preventive chemotherapy and transmission control (PCT) for soil-transmitted helminthiases [<a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0006053#pntd.0006053.ref024" target="_blank">24</a>] (infection prevalence <20%). while the other 34 require PCT. The 69 countries shaded in yellow had no studies identified here, and have been designated by the World Health Organization as requiring PCT. The map was created using freely available country outline data from Natural Earth (naturalearthdata.com).</p
