**2. Materials and methods**

All data were obtained from literature searches, by using the search engines Scopus and Pubmed. Because of the complexity of the subject, only the most relevant studies were se‐ lected, and reviews were prioritized. Old literature was accessed electronically, or hard cop‐ ies were obtained from libraries. Information on human exposure and health effects was based on reviews published over the past ten years and supplemented with recent studies on exposure due to indoor spraying and treated bednets.
