Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Children's Health

Font Size

Parents, Schools Overreact to Head Lice, Expert Says

WebMD Health News

Aug. 24, 2000 -- The start of the school year can mean more than just back-to-school shopping trips and first-day-of-class jitters; for many children, it also means creepy, crawly head lice. Even hearing the words makes most people wrinkle their noses in disgust. But are the strict measures taken against head lice -- such as the so-called "No Nits" policy that bars children with even one louse egg from attending school -- warranted, or are they overkill?

For one scientist from the Harvard School of Public Health, society has definitely gone overboard, overdiagnosing, overtreating, and overworrying about a minor nuisance that doesn't even qualify as a public health issue.

"We are dealing with head lice: They don't cause disease, they don't transmit anything, and we think they are much less contagious than people believe," says Richard Pollack, PhD, an instructor of immunology and infectious diseases.

Pollack and his team of researchers recently published a study in the Pediatric Infectious Disease Journal that showed that in about 40% of cases, head lice are incorrectly diagnosed, leading to unnecessary treatments and unnecessary absences from school.

Pollack invited people who visited a web site that provides information on head lice to submit specimens of items that they considered to be lice or nits. The researchers examined the samples under a microscope within two days of receiving them. Each sample was identified by the species of louse and its life stage (egg, nymph, or adult). A person was considered infected if their sample included at least one adult or nymph louse, or a louse egg capable of hatching.

The researchers received more than 600 samples, each containing from one to 100 or more objects. Lice or their eggs were found in 60% of the samples; other critters, such as beetles, mites, and bedbugs, were found in 5%. The rest contained other debris, including dandruff, scabs, fibers, dirt, and knotted hair.

Slightly more than half of the samples that actually did contain lice or nits had a living louse or egg capable of hatching (indicating an active infestation); the other half were either hatched eggs or dead eggs.

1 | 2 | 3

Today on WebMD

child with red rash on cheeks
What’s that rash?
plate of fruit and veggies
How healthy is your child’s diet?
smiling baby
Treating diarrhea, fever and more.
Middle school band practice
Understanding your child’s changing body.

worried kid
jennifer aniston
Measles virus
sick child

Child with adhd
rl with friends
Syringes and graph illustration