Remarks WHO recommends ITNs that have been prequalified by WHO for use in protecting populations at risk of malaria, including in areas where malaria has been eliminated or transmission interrupted but the risk of reintroduction remains. ITNs are most effective where the principal malaria vector(s) bite predominantly at night after people have retired under their nets. ITNs can be used both indoors and outdoors, wherever they can be suitably hung (though hanging nets in direct sunlight should be avoided, as sunlight can affect insecticidal activity).

Practical Info The current WHO policy recommendation for ITNs applies only to those mosquito nets that have been prequalified by WHO and that contain only an insecticide of the pyrethroid class (categorized as ‘pyrethroid-only LLINs’) (24). For ITNs that currently do not have a policy recommendation, including nets treated with another class of insecticide either alone or in addition to a pyrethroid insecticide, WHO will determine the data requirements for assessing their public health value based on technical advice from the Vector Control Advisory Group (VCAG).