CDC Pushing New Mosquito Repellents

After years of promoting the chemical DEET (search) as the best defense against West Nile-bearing mosquitoes, the government for the first time is recommending the use of two other insect repellents.

Repellents containing the chemical picaridin (search) or the oil of lemon eucalyptus offer "long-lasting protection against mosquito bites," the Centers for Disease Control and Prevention said, adding that repellents with DEET remain on the agency's recommendation list.

"Since West Nile virus is present across the entire country at this point and it's here to stay, we constantly need to be vigilant," said Dr. Lyle Petersen, director of the CDC's division of vector-borne infectious diseases. "It gives consumers a better option to protect themselves."

Both products have been available elsewhere in the world, including Europe and Australia, since the 1980s. Repellent makers have been eager to introduce them to U.S. markets but it was hard to compete with DEET, the only chemical touted as effective by local, state and federal health officials.

Federal officials maintained for years that non-DEET repellents were not likely to offer the same degree of protection from mosquito bites. DEET has been the go-to chemical for health officials trying to control the spread of the West Nile virus in the United States.

However, recent studies prompted CDC officials to broaden the recommendations. The CDC says picaridin is "often comparable with DEET products of similar concentration" and oil of lemon eucalyptus provides protection time "similar to low-concentration DEET products in two recent studies."

Consumers tend to like picaridin repellents because they are more pleasant to the skin and don't have the odor that DEET repellents have. And oil of lemon eucalyptus is a natural ingredient, which appeals to those who don't like the thought of putting chemicals on their skin, said Angela Proctor, a product manager for the Cutter line of insect repellents by Spectrum Brands.

Nationwide, only about 40 percent of people use insect repellents. In Pacific coast states such as California — the state with the highest number of cases (771 cases, 23 deaths) last year — only 23 percent use insect repellent, said Emily Zielinski-Gutierrez of the CDC.

"That's a lot of people who are going out there unprotected," she said.

Users complained of DEET's odor or said it feels unpleasant on the skin. DEET repellents also have reportedly damaged plastics and fake fingernails. Other people have speculated it could cause brain damage, although the Environmental Protection Agency said the chemical won't cause harm if used properly.