18 April 2007 Electronic Mosquito Repellents Found To Be Ineffective
Gadgets known as electronic mosquito repellants that emit high-pitched sounds were found not to have any effect on the pesky insects, according to a meta-study in the Cochrane Review . The researchers said they failed to find any evidence that electronic mosquito repellents (EMRs) work to deter the insects and that there is no reason for recommending their use.
The manufacturers of EMRs claim that the high pitched sound emitted by the devices repels female mosquitoes, protecting people in the vicinity from bites and disease. The Cochrane study analyzed ten EMR field trials that had been carried out in various parts of the world. None of the trials showed any evidence that EMRs work.
"All ten studies found that there was no difference in the number of mosquitoes found on the bare body parts of the human participants with or without an EMR," says the study's author, Dr Ahmadali Enayati, from the Mazandaran University of Medical Sciences in Iran.