Thursday, July 30, 2009

Control Mosquitoes - Choose Repellents Wisely, Use Them Safely

By Russ Frank

Did you know that mosquitoes can sense the presence of humans even from far away? They're attracted to the heat, humidity and the carbon dioxide that are given off. Most mosquito repellents work by hiding the chemical cues that attract mosquitoes. A good repellent will offer protection for a long period of time after just one application. That's important because many diseases like West Nile virus are transmitted by mosquitoes.

It's important to remember that mosquito repellents do not protect everyone equally. Many factors are involved including the type of mosquito and the age, sex, and level of activity of the person involved. Remember too that mosquito repellent only works on the surface to which it's applied directly.

One of the most effective repellents is DEET. Another good one is picaridin. The Center for Disease Control (CDC) recommends these products because they work well and offer long lasting protection. DEET was first offered for sale in 1957 and has an excellent safety record.

Mosquito repellent products come in many concentrations. Which you choose will depend on how long you're typically outside. If you're usually out 3-4 hours, you might look for a product with 20% or more of DEET. However, scientists tell us that products containing more than 50% DEET do not offer extra protection. If you're often outside for less than 3 hours a product with less than 20% DEET or 7% picaridin offers good protection.

According to various agencies and organizations, these mosquito repellents products are safe. Environmental Protection Agency (EPA) says DEET does not pose any health threat and is not a human carcinogen. The CDC recommends not combining sunscreen products with other products containing DEET. According to the American Academy of Pediatrics products that contain DEET are safe to use on children over two months old.

Oil of lemon eucalyptus and IR3535 are two other active ingredients recommended by CDC. While they do provide good protection, they don't last as long as the higher concentrations of DEET. According to test done by EPA, oil of lemon eucalyptus provides about the same length of protection as the lower concentrations of DEET. Read the label of any product using this ingredient. Children less than 3 years of age should not be exposed to this ingredient.

Numerous studies of the ultrasonic mosquito repellent devices have failed to prove they work. In addition, there is no evidence that eating onions, garlic, vitamins or any other food will repel mosquitoes. As for the portable mosquito traps that emit carbon dioxide, there has not been enough testing for scientists to draw conclusions.

Here are the ground rules for using mosquito repellents safely: Read and follow the instructions on the label. Only apply these products to exposed skin. Don't use these products under clothing. Don't apply to cuts, wounds or rashes. Don't apply near eyes or mouth, and apply lightly around the ears. Don't allow children to apply these products. When you return indoors, wash with soap and water or bathe.

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