1.- Traditional water storage vessels and water storage vessels that have
been modified to reduce contamination during storage. Storage vessel A is a traditional
Egyptian zir30; B, plastic container used to sell vegetable oil in Zambia31; C,
traditional cantero from El Salvador; D, sorai used in an intervention trial in
India32; E, tin bucket used in an intervention trial in Malawi33; and F, plastic
container meeting the Centers for Disease Control and Prevention/Pan American
Health Organization design criteria and used in an inter-vention trial in Bolivia.