Definition

Lice are small, insect-like parasites. Parasites are animals that live off other animals. Lice live on the human body, most commonly on the skin, hair, and genital area. They feed on human blood and lay their eggs on body hair and in clothing. The word "lice" is plural for the word "louse."

Description

Lice do not cause dangerous infections. However, they may carry organisms that cause more serious diseases, such as trench fever and typhus. Lice tend to be a problem primarily in overcrowded areas or areas that have inadequate facilities for bathing and laundry. They are often a problem among the homeless or in military or refugee camps. All humans are equally at risk to attack by lice, but elderly people are more prone to develop complications from lice attacks.

Causes

The three common types of lice infestation are head lice, body lice, and pubic lice...