Source:http://linkedlifedata.com/resource/umls/id/C0030757
MEDLINEPLUS: <p>Head lice are parasitic wingless insects. They live on people's heads and feed on their blood. An adult is called a louse and is about the size of a sesame seed. The eggs, called nits, are even smaller - almost like a dandruff flake. Lice and nits are easiest to detect at the neckline and behind the ears.</p><p>Head lice are extremely contagious. Close contact or sharing personal belongings, such as hats or hairbrushes, puts people at risk. Children ages 3-11 and their families get head lice most often. Personal hygiene has nothing to do with getting head lice.</p><p>Symptoms are </p><ul><li>Tickling feeling in the hair</li><li>Frequent itching</li><li>Sores from scratching</li></ul><p>The most important step in treating head lice is to treat the person and other family members with medicine to kill the lice. </p><p style="font-weight:bold;font-style:italic;">Centers for Disease Control and Prevention </p>