Medical and Veterinary Importance of Lice
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Transcript of Medical and Veterinary Importance of Lice
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Medical and veterinary
importance of lice
Prepared by
Abdallah M. SamyAbdallah M. Samy
Entomology Department
Faculty of Science
Ain Shams University
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LiceO: Phthiraptera
(sucking and Chewing lice)
Sucking lice Chewing lice
F1:Pediculidae
F2: Haematopinidae
F3: Philopteridae
F4:Menoponidae
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F1:Pediculidae
e.g. Pediculus h. humanus (body louse)
�Dorso-ventrally flattened.
� Clinging legs
� Wingless.
� pale beige or grayish in color in color.
e.g. Pediculus h. capitis (Head louse)
�Dorso-ventrally flattened.
� Clinging legs
� Wingless.
� Dark in color with;
� Festoons-like structures laterally on its body.
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Lice life cycle
�Both adult and immature stageslive permanently on humans “permanent ectoparasite”, clingingmainly to hairs of their clothing andusually only to body hairs duringfeeding.
� Both sexes, as well as� Both sexes, as well asimmatures, take blood-meals atany time of day or night.
� Females lay their eggs on clothesfibers/ hairs.
� Lice have 3 nymphal instars.
� The third nymphal instar is thendevelop to adult
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Medical importance of Lice
�Pediculosis: an infestation of lice -- which are
parasitic insects -- on the bodies of humans.
� Lice as a vector for diseases:� Lice as a vector for diseases:
� Louse-borne epidemic typhus
� Trench fever
� Louse-borne epidemic relapsing fever
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F2: Haematopinidae
Haematopinus tuberculatus(Cattle louse)
A parasite of the waterA parasite of the waterbuffalo; it also infestsdomestic cattle when inassociation with waterbuffaloes. It causes irritationto the infested animal.
Copyright to MCP, 1998
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Chewing Lice
Family3:Philopteridae
Lipeurus caponis�They are permanent ectoparasites on birds, where they
feed on sloughed epidermal tissues, feathers and
sebaceous secretions of the host.
�Parts of feathers, particularly the barbs and barbules
constitute a major part of the food of this louse.
�The irritation louse feeding causes the host to become
restless, therefore affecting its feeding, habits and
digestion. Egg production is greatly reduced and
development retarded.
� Lice tend to be abundant where uncleanliness and
overcrowded conditions exists.
�Generally chewing lice act as intermediate hosts to the
tapeworms Dipylidium caninum as it is easy for lice to
become infected by swallowing worm egg capsules.
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F4: Menoponidae
Menopon gallina
Biting and annoyance
Chewing lice don't attack man but
several species are importantseveral species are important
pests of domestic animals,
especially poultry; they feed on
feathers or hairs of the host, may
cause considerable losses in the
wool, meat, and diary production.
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