The World Health Organization (WHO) recommends preventive chemotherapy (PC) as the primary intervention to control morbidity of soil-transmitted helminthiasis (STH). In this series of maps we present the progress of the PC coverage in the different countries (different shades of yellow) and the need of conducting impact survey (peach); countries that already conducted impact survey are presented in green (
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The boundaries and names shown and the designations used on this map do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. Dotted and dashed lines on maps represent approximate border lines for which there may not yet be full agreement. The borders of the map provided reflect the current political geographic status as of the date of publication (2021). However, the technical health information is based on data accurate with respect to the year indicated (2020). The disconnect in this arrangement should be noted but no implications regarding political or terminological status should be drawn from this arrangement as it is purely a function of technical and graphical limitations.

Region Not started or not 100% geog. coverage Implementing STH PC intervention Need of impact survey Full impact survey done and PC modified No data
Africa (AFRO) Angola, Equatorial Guinea, Gabon Botswana, Central African Republic, Chad, Congo, Democratic Republic of the Congo, Ethiopia, Gambia, Guinea-Bissau, Lesotho, Madagascar, Nigeria, South Sudan, Uganda, Zambia Guinea, Mozambique, Sao Tome and Principe, South Africa, Swaziland, Tanzania Benin, Burkina Faso, Burundi, Cabo Verde, Cameroon, Comoros, Cote D'Ivoire, Ghana, Liberia, Kenya, Malawi, Mali, Niger, Rwanda, Senegal, Sierra Leone, Togo, Zimbabwe  
Americas (PAHO)   Colombia, El Salvador, Guatemala, Guyana, Haiti Honduras Mexico, Nicaragua, Paraguay, Venezuela Brazil, Dominican Republic Bolivia, Ecuador, Perù
South-East Asia (SEARO)    Indonesia, Nepal, India** Democratic Republic of Korea, Timor-Leste Bangladesh, Bhutan, Myanmar  
Europe (EURO)  Uzbekistan   Kyrgyzstan, Tajikistan    
Eastern Mediterranean (EMRO) Pakistan Yemen, Somalia  Afghanistan, Iraq, Syria Sudan Djibouti
Western Pacific (WPRO)  Papua New Guinea, Micronesia, Solomon Islands Fiji, Kiribati, Marshall Islands, Philippines, Tuvalu, Vanuatu Vietnam Cambodia, Laos Tonga
Total of countries 8 31 18 26 5
** large country with regions showing different progresses in implementation and impacts
Laboratory of Parasitology and Parasitic Diseases
Department of Veterinary Medicine and Animal Production
University of Naples Federico II


Prof. Laura Rinaldi
phone: +39 081 2536281
Prof. Giuseppe Cringoli
phone: +39 081 2536283
Prof. Maria Paola Maurelli
phone: +39 081 2536014
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