Focus on vector-borne disease control
Impact Story

Fighting monkey malaria in Malaysia with K- Othrine ® PolyZone ® insecticide​

According to the WHO World Malaria Report 2024, Malaysia has reported zero human malaria cases for six consecutive years and is moving toward being declared malaria-free. However, in 2023, the country saw a surge in zoonotic malaria – originating from monkeys and transmitted by outdoor-biting mosquitoes of the *Anopheles leucosphyrus* group – with 2,879 cases and 14 deaths. Unlike human malaria, which is typically controlled with indoor residual spraying (IRS), zoonotic malaria requires outdoor control strategies. In response, Malaysia became the first to study outdoor residual spraying (ORS) using K-Othrine® PolyZone®, a weather-resistant insecticide developed by Envu. Field trials, in collaboration with the Institute for Medical Research (IMR), were conducted in selected villages in Sabah and Sarawak to assess its effectiveness and environmental impact. This initiative highlights the importance of multi-stakeholder partnerships in preventing future malaria outbreaks.
Envu also contributed to a Malaysian consortium of public and private sectors to study the effectiveness of integrated vector management programs, including one with K-Othrine® PolyZone® insecticide for targeted residual spray. This comprehensive study initiated by Envu, covered 23% of the population of Kuala Lumpur in Malaysia and spanned five years (2019-2023). Researchers concluded that a well-conducted integrated management program significantly reduces dengue cases.

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