Mosquito repellents should contain which active ingredient to effectively reduce malaria risk?

The active ingredient that is most effective in reducing the risk of malaria in mosquito repellents is DEET. This compound has been extensively studied and proven to be highly effective in repelling mosquitoes that can transmit malaria, as well as other diseases. DEET works by interfering with the mosquitoes' ability to sense human skin, making it a reliable barrier against bites.

In comparison, while Picaridin is also an effective repellent and can provide similar protection to DEET, it is not as widely recognized for its effectiveness against malaria specifically. Citronella and eucalyptus oil, though natural and commonly used in some products, have not been shown to provide the same level of effectiveness as DEET in preventing bites from mosquitoes that spread malaria. Therefore, the presence of DEET in mosquito repellents is critical for those at risk of malaria to ensure they have adequate protection from mosquito bites.