Mon Jan 06 07:11:27 UTC 2025: ## Mosquito Repellents: How DEET and Others Work to Keep the Pests Away

**Melbourne, Australia** – Summer’s here, and with it comes the unwelcome buzz of mosquitoes. These insects, responsible for more human deaths than any other animal, are thriving due to the warm temperatures and abundant water sources. While physical barriers like netting offer the best protection, they aren’t always practical. This is where insect repellents come in.

A chemistry expert from Swinburne University of Technology, Dr. Daniel Eldridge, explains the science behind these common products. Mosquitoes are attracted to carbon dioxide in our breath, lactic acid in sweat, and various skin odors. Repellents interfere with this complex attraction process.

The most well-known repellent, DEET (N,N-diethyl-meta-toluamide), has been used since 1957. Studies show it’s safe and effective when used as directed, though its exact mechanism isn’t fully understood. It appears to either mask our scent, making us less attractive to mosquitoes, or cause them to avoid landing on treated skin.

Picaridin (icaridin) is a more recent alternative, proving equally or even slightly more effective than DEET in some studies and with a less pungent odor. Para-menthane-3,8-diol (PMD), a chemically treated form of oil of lemon eucalyptus, also demonstrates effectiveness as a repellent. Both picaridin and PMD efficacy depends on concentration and the mosquito species.

However, popular citronella products, including candles, are far less effective than DEET and its alternatives, according to research. Other natural remedies also often lack the proven effectiveness of DEET and picaridin.

Dr. Eldridge emphasizes the importance of using proven repellents like DEET and picaridin, particularly for disease prevention. While sound-based devices and repellent bracelets have shown little effectiveness in studies, the benefits of established repellents significantly outweigh potential risks. Always follow product instructions for safe and effective application.

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