Free re-treatment is provided in campaigns in the east Asian countries, where insecticide-treated nets have been deployed on a large scale since the early 1990s, and in several African countries with high net coverage.
1990年代初以来就大规模使用驱虫蚊帐的东亚国家和一些蚊帐普及率高的非洲国家都在宣传提供免费的再处理。