In this presentation, we discuss how tourism in Zanzibar may add to the number of mosquito breeding places and thus increase the use of chemical insecticides, which is a major environmental strain to Zanzibar. Furthermore, we will discuss how mosquitoes become resistance to the insecticides and how tourism affect this resistance development. Would you like to learn more about Sustainable Tourism? Sign up for our online course: Sustainable Tourism - promoting Environmental Public Health? (indsæt hyperlink over titel, hvis muligt https://www.coursera.org/learn/sustainable-tourism You are also welcome to join other MOOCs from University of Copenhagen. (indsæt hyperlink, hvis muligt https://coursera.org/ucph). Flemming Konradsen Professor, Director, School of Global Health, University of Copenhagen