Device kills head lice, eggs in study

SALT LAKE CITY (AP) -- Head lice -- those nasty nuisances for schoolchildren and parents -- were blown away in a half-hour by a device resembling a blow-dryer that its inventors call the "LouseBuster," university researchers report.

The device, which kills bugs and eggs by drying them out, might one day offer an alternative to the powerful delousing shampoos and literal nit-picking currently necessary for dealing with this problem.

The LouseBuster results were reported in the November issue of the journal Pediatrics by University of Utah researchers, who said the device eliminates infestations by preventing reproduction.

The study, involving 169 children in the Salt Lake area, showed that the LouseBuster killed 80 percent of hatched lice and 98 percent of eggs on infested children. Enough bugs were killed to prevent the remaining lice from breeding so "virtually all subjects were cured of head lice when examined one week following treatment with the LouseBuster," the scientists wrote.

"The idea would be that instead of sending kids home from school, which is a hardship on kids and the parents, a kid might be able to go to the front office and get treated" and return to class, said biologist Dale Clayton, the co-inventor and leader of the research.

The appliance works by blowing twice as much air as a regular blow-dryer, he said. Treatments typically take 20 to 30 minutes, he said, although they lasted 30 to 35 minutes in the study.

Mr. Clayton studies birds and lice, but after moving to Salt Lake City from England in 1996, he found the air too dry to keep lice alive on laboratory birds. He had to humidify rooms to keep the bugs alive. If dry air could kill lice on birds, Mr. Clayton reasoned, it might do the same on humans.

Then the project became personal for Mr. Clayton: His own children had head lice.

He found temperature wasn't as important as the amount of air, but the air blowing from his device is cooler than with a standard hair dryer.

Larada Sciences, a University of Utah company set to market the LouseBuster to schools and doctors, thinks the device could be available within two years.

"The device itself will be definitely under $2,000, and hopefully under $1,000," Larada President Randy Block said. "While that sounds like a lot, think about the average parent spending $40 or $50 for a treatment."

Among the children in the study group were students from Mountain View Elementary, where lice infestations commonly strike 10 to 15 at a time. Students are sent home for days until the bugs are removed.

"I hate when we send kids home," said Principal John Erlacher, adding that he "can't wait" for an opportunity to obtain a LouseBuster.

Chemical shampoos are the most common method for treating head lice. But they often require multiple applications and don't always kill eggs. That leaves many parents picking the bugs and eggs out by hand.

The research was supported partly by the National Pediculosis Association, a nonprofit group based in Needham, Mass., that wants to end chemical treatment of lice.