Many of us have received that dreaded note from school: head lice in your child's class. Thankfully, shaved heads and home-schooling are not your only recourses.

The most important thing is to separate the facts about head lice from the fiction so that children, parents and educators can most effectively avoid them.

Fact: Head Lice is Common

Despite the first reaction many parents have ("Why me?!") when spotting a louse on their child's head, it's important to remember that lice is very common among school kids. In other words, you are not alone.

According to the Centers for Disease Control and Prevention (CDC), an estimated 6 to 12 million cases occur each year in the United States among kids 3 to 11 years of age.

They tend to spike around back-to-school time in the fall and again in January, according to the U.S. Food and Drug Administration (FDA), though outbreaks can occur year-round.

Factors That Enhance the Spread of Lice

Preventing lice begins with an understanding of how they thrive and spread. In order for lice to live and create eggs, they need heat - body heat in particular - and they need to feed on blood. The other risk factor for infestation is the combination of crowded conditions and close contact.

Lice most commonly spread through head-to-head contact, so it makes sense that younger kids - particularly those attending preschool, child care or elementary school - are more likely than older kids to pick them up.

Girls also appear to be more prone to head lice than boys, though the reasons are not fully established.

Prevention Starts at Home

It makes sense to regularly run your hands through your child's hair to be on the lookout for live lice or eggs (nits).

You want to get close to the scalp. The eggs are probably a little easier to see if the hair is dry because the hair can be separated more.

What to Do if Lice Are on the Prowl

If you do have reason to believe that a friend or classmate of your child may have lice, you'll want to start by deploying the following avoidance measures:

  1. Avoid head-to-head contact: Since direct contact is the main means of conveyance, both the CDC and the FDA advise instructing children to avoid head-to-head contact with friends and classmates (at home and at school).
  2. Stop sharing headgear: The research is mixed on whether lice can be transferred via headwear or hair products, but both agencies recommend that children avoid sharing clothes, hats, scarves, headphones and towels, as well as hair products such as combs, brushes, bandanas and hair ties.
  3. Don’t pile on: It's also smart to avoid keeping items in piles, whether at home, daycare or school. A better move is to have students assigned individual hooks, lockers or cubbies for storing clothing and other items - and trying the same method for visitors to your home.

If You Suspect an Infestation at Home

If your child displays any of the telltale signs of head lice (including itching, sores caused by scratching, a tickling or moving feeling in the hair or irritability in bed or difficulty sleeping), you'll want to determine for sure whether your child has lice.

The best method for making a diagnosis is to comb his or her hair with a fine-tooth comb as close to the scalp as possible, section by section, looking for live lice and nits.

If you detect live lice, you'll need to treat the problem, typically by using a combination of medicated shampoo, ointment or lotion and wet combing, though you may be able to treat lice through combing alone. Check with your pediatrician about the treatment methods that would best suit your child's age and your comfort level with chemical preparations.

While treating an infestation in your home, you can also take some steps to help prevent the problem from spreading. These measures, though, are optional and would not replace treating the problem directly with medicine and/or thorough combing.

  1. Keep combs and brushes clean: Avoid sharing combs and brushes used by anyone with lice and soak them in water heated to at least 130 F for 5 to 10 minutes to disinfect.
  2. Keep your head up: Avoid lying on beds, pillows, sofas, rugs or stuffed animals that have recently been in contact with a person with lice, and vacuum areas of your home, including furniture, where the infested person has sat or lain.
  3. Make a laundry run: Wash and dry clothes, sheets and other items that have been in contact with the head of a person with lice during the prior two days using hot water (at least 130 F) and a dryer on high heat. If an item is not washable, have it dry-cleaned or stash it in an air-tight plastic bag for at least two weeks (live lice can't survive longer than two days without a blood meal, and nits can't survive without the warmth of a host for longer than about a week).

Education is Key

It's important to recognize that lice infestations occur regardless of personal hygiene or the cleanliness of one's home.

The more informed parents, students and teachers are about lice, the more likely it is that preventive strategies will work--and that social stigmas and misunderstandings will subside.