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Image Number 383 (Pediculosis capitis)

Other Morphologies

Diagnosis: Pediculosis capitis

Site: Other

Sex: F

Age: 5

Type: Clinical

Description: Head louse

Submitted by: Shahbaz Janjua

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Differential Diagnosis


Pediculosis capitis or head louse is caused by infestation of scalp with the highly host-specific insect, Pediculus humanus capitis.  The highest incidence occurs in school-aged children, primarily girls, aged 3-12 years.  The most important mode of transmission remains direct head-to-head contact for a prolonged period.  The head louse is 1-2 mm in length, dorsoventrally flattened, and elongated with narrow sucking mouthparts hidden inside the structure of the head. It has three pairs of clawed legs that are adapted to grasp hairs. 


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