Treating Head Lice

There are four key steps to eliminating head lice and preventing their return: 

The child or infected person(s) should be treated with a pediculicide shampoo formulated specifically to control lice. Several different products, most containing permethrin or pyrethrins, are available through pharmacists and physicians. Follow the directions on the package. Some products require retreatment in 7 to 10 days. If one family member is found to be infested, all others should be examined. Only those showing evidence of lice should be treated. All infested family members should be treated within a 24-hour tme span to prevent reinfestation from one person to another. More than half of lice-infested children have another infested family member at home. 

Remove all nits using a fine-tooth louse comb. Although this step can be quite time-consuming, nit removal is critical to eradication. Louse control shampoos often do not kill all the nits, and surviving eggs will hatch within 7 to 10 days, continuing the cycle of reinfestation. Dead nits also tend to remain attached to the hair, causing uncertainty about reinfestation. Nits are most easily removed by combing while the hair is slightly damp. Adding conditioner, olive oil, or a 50:50 vinegar-water solution may also make combing easier. Nits can also be picked out with fingernails or cut out with small safety scissors. 

All personal articles that have been in contact with the patients's head should be deloused. Normal laundering with hot, soapy water (125 degrees F for 10 minutes), or dry cleaning will kill lice and nits on clothing, bed linens and towels. Combs and brushes should be soaked for 10 minutes in a pan of very hot water. (Note: steps 1-3 should be performed at the same time in order to avoid reinfestation after shampooing). As an added precaution, car seats, furniture, and carpeting contacted by infested individuals should be vacuumed with the vacuum bag being discarded. 

To reduce the chance of reinfestation, children should be instructed not to share hats, clothing or brushes with their classmates. Each child should have a separate storage space for their hats and other clothing at home and school to prevent contact with other garments. If this is not possible, coats should be hung on hooks so they do not touch, or on the backs of students' chairs. Treatment of the premises or clothing with insecticides is generally not required or recommended for the control and prevention of head lice. This is because the lice cannot survive for any extended length of time off of their human host. 
Elimination of a head lice outbreak in a school, nursing home or similar shared facility requires prompt, coordinated action and administrative support to prevent the spread of lice to uninfected individuals. Unless all affected persons are treated, the condition will continue. 

How to treat Persistent Head Lice Infestations ?

Despite all the above efforts, there are times when a head lice infestation seems to persist indefinitely. Persistent infestation may be due to various causes, one of the most likely being improper use of the pediculicide (e.g. insufficient time shampoo left on the hair, or failure to reapply after 7 to 10 days). Other times, not enough time was spent combing out the nits or no effort was made to concurrently treat other infested family members. 

In rare, but increasing instances, the product in use may have lost its effectiveness. Head lice resistance to pediculicides has been documented recently in certain areas of the world, especially to permethrin. Resistance to pyrethrin/piperonyl butoxide formulations appears to be less common. if resistance is suspected to the pediculicide you have been using, consult with your physician.