This blog is intended to go along with Population: An Introduction to Concepts and Issues, by John R. Weeks, published by Cengage Learning. The latest edition is the 12th (it came out in 2015), but this blog is meant to complement any edition of the book by showing the way in which demographic issues are regularly in the news.

If you are a user of my textbook and would like to suggest a blog post idea, please email me at: john.weeks@sdsu.edu

Thursday, February 21, 2013

Insect Repellent No Longer so Repellent

Insecticides such as DEET have been important in protecting humans from potentially deadly insect bites, especially those from mosquitos. However, BBCNews reports on a paper just published by researchers at the London School of Hygiene and Tropical Medicine suggesting that mosquitos are getting used to DEET.
They say more research is needed to find alternatives to Deet, which was first developed by the US military.
Deet - or N,N-diethyl-meta-toluamide - is one of the most widely used active ingredients in insect repellents. It was developed by the US military, following its experience of jungle warfare during World War II. 
The research was carried out on Aedes aegypti, a species of mosquito that spreads dengue and yellow fever. [The anopheles mosquito is the primary carrier of the malaria parasite.]
One of the interesting things about recent research has been the discovery of how DEET really works. The mosquitos don't like it's smell. Who knew! Unfortunately, it seems as though they are able to get past their initial repulsion to the smell, so the effect of DEET may be more limited than it used to be. This is not good news, of course.

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