Pediculus capitus
Characteristics
Size: Up to 1/8-inch in length.
Color: Grayish-white in appearance.
Behaviour
The occurrence of head lice is somewhat common among school-age
children, particularly those in primaryschools. Younger children
are more likely to wrestle, hug, sleep close together, or share
hats, clothing, and brushes and combs -- all methods by which head
lice might be transferred from person to person. For this reason,
head lice are a concern to most parents.
Head lice begin their lives as eggs or “nits.”
The term “nitpicking” originated from the painstaking
efforts required to go through a person’s hair to remove head
lice and their eggs. The female louse attaches each egg to the base
of a hair near to the scalp. One female can deposit 80 to 100 eggs
during her lifetime. Nits are somewhat oval and have a cap on the
top through which the nymph will emerge. They are often confused
with globules of hair spray on hairs, but an experienced eye can
easily distinguish the difference. If the nit is found one inch
or further from the scalp, it is likely already hatched or is dead.
The eggs hatch in approximately seven to nine days
and the nymphs begin feeding on blood through the scalp. The nymph
will molt three times before maturing into an adult -- a process
completed in eight to nine days. Adults may live about three weeks
or a bit longer.
Because lice generally feed at night, infected
persons will experience the most discomfort and itching while trying
to sleep.
Habitat
The human head louse is almost exclusively found living within the
hairs of the human head. Lice can survive short periods on hats,
brushes, combs, pillows or towels. They will, however, die within
24 to 48 hours off the host.
Tips for Control
The presence of head lice is a medical issue and should be diagnosed
and treated by a physician. Typically, a physician will prescribe
a louse control shampoo or similar product. Also, a fine-toothed
comb may be used to help remove lice and some nits from hairs. It
is important to note that the label directions of any louse control
product should be strictly followed. Reports of concerned or panicked
parents applying such products daily or at higher than label-directed
dosages have occurred. Such misuse of these products is potentially
unsafe for the lice-infested person; much like taking a higher dose
of medication than recommended by a physician is unsafe.
A pest management professional can do nothing to
help in dealing with this insect. The premises do not require treatment.
Noninfested family members should not share combs, brushes, hats,
towels or bedding with an infested person until that person’s
louse infestation has been eliminated. Use hot water and detergent
to wash bedding, clothing, towels, etc. that have been in contact
with an infested person. Combs and brushes can be boiled for a minute
or so in water and then washed thoroughly with soap and water. |