Overview
What is pediculosis and pthiriasis (lice infestation)?
How do lice cause pediculosis and pthiriasis?
What is the life-cycle of lice causing pediculosis?
Which species of lice cause pediculosis and pthiriasis (lice infestation)?
How are pediculosis and pthiriasis (lice infestation) used in forensics?
How prevalent is cross-species pediculosis and pthiriasis (lice infestation)?
Where is the classification of human lice found in pediculosis and pthiriasis (lice infestation)?
How are lice characterized in pediculosis and pthiriasis (lice infestation)?
What is the pathophysiology of human lice in pediculosis and pthiriasis (lice infestation)?
What are the types of human lice in pediculosis and pthiriasis (lice infestation)?
How are head and body lice differentiated in pediculosis and pthiriasis (lice infestation)?
How is pediculus humanus capitis (head lice) spread?
How is pediculus humanus corporis (body lice) spread?
What are the features of pthirus pubis (crabs) in pthiriasis (lice infestation)?
Where do pthirus pubis (crabs) populate in pthiriasis (lice infestation)?
What is the mobility of pthirus pubis (crabs) in pediculosis and pthiriasis (lice infestation)?
What are the characteristics of lice nits in pediculosis and pthiriasis (lice infestation)?
What are the causative organisms of pediculosis and pthiriasis (lice infestation)?
How is P humanus capitis (head lice) spread in pediculosis and pthiriasis (lice infestation)?
How is P pubis (crabs) spread in pthiriasis (lice infestation)?
Why is P pubis infestation (crabs) classified as an STD?
How is P pubis (crabs) contracted in children?
Why is the prevalence of pediculosis (lice infestation) unknown?
What is the annual incidence of pediculosis (lice infestation) in the US?
What is the prevalence of pediculosis (lice infestation) in schools?
Which patient group is at highest risk for body louse infestations?
How does the incidence of pediculosis (lice infestation) vary by geographic region?
What is the global prevalence of pediculosis (lice infestation) in school children?
What is the global prevalence of pediculosis and pthiriasis (lice infestation)?
What is the global prevalence of body lice in pediculosis and pthiriasis (lice infestation)?
What are the racial predilections of pediculosis and pthiriasis (lice infestation)?
How does the incidence of pediculosis and pthiriasis (lice infestation) vary by sex?
Which age groups are at highest risk for pediculosis and pthiriasis (lice infestation)?
What is the prognosis of pediculosis and pthiriasis (lice infestation)?
What are the causes of treatment failure in pediculosis and pthiriasis (lice infestation)?
What are possible complications of pediculosis and pthiriasis (lice infestation)?
What is included in the treatment of pediculosis (lice infestation)?
What measures have been taken to reduce pediculosis (lice infestation) in schools?
How can compliance with the treatment of pediculosis and pthiriasis (lice infestation) be improved?
What is included in the treatment of pthiriasis (lice infestation)?
Presentation
How are pediculosis and pthiriasis (lice infestation) typically first identified?
What is the most common symptom of pediculosis and pthiriasis (lice infestation)?
What are the signs and symptoms of pthiriasis (lice infestation)?
How are bite reactions characterized in pediculosis and pthiriasis (lice infestation)?
How is pediculosis and pthiriasis (lice infestation) diagnosed?
How can head lice be found in the exam for pediculosis and pthiriasis (lice infestation)?
How large are mature lice in pediculosis and pthiriasis (lice infestation)?
What are the physical findings characteristic of pediculosis (lice infestation)?
How does the pruritus of pediculosis (lice infestation) progress?
How is the hair of patients with severe pediculosis (lice infestation) characterized?
How can the duration of pediculosis and pthiriasis (lice infestation) be estimated?
What are the physical findings of body lice in pediculosis and pthiriasis (lice infestation)?
What is a pathognomonic physical finding of pediculosis and pthiriasis (lice infestation)?
What is the primary symptom of pthiriasis (lice infestation)?
What is the most common site of pthiriasis (lice infestation)?
Outside the pubic hair, where is pthiriasis (lice infestation) found?
How is pthiriasis (lice infestation) usually acquired in children?
What are the indications of excoriations in pthiriasis (lice infestation)?
Which infections may be transmitted by pediculosis and pthiriasis (lice infestation)?
What are the complications of pediculosis and pthiriasis (lice infestation) caused by body lice?
What are the signs and symptoms of trench fever in pediculosis and pthiriasis (lice infestation)?
DDX
How is pediculosis (lice infestation) differentiated from pseudonits?
How is pediculosis differentiated from other scalp conditions?
Which conditions should be included in the differential diagnosis of pediculosis (lice infestation)?
Which conditions should be included in the differential diagnosis of pthiriasis (lice infestation)?
Workup
How is a diagnosis of pediculosis and pthiriasis (lice infestation) confirmed?
Which disorders should be screened for in the workup of pthiriasis (lice infestation)?
What is the role of fungal culture in the workup of pediculosis and pthiriasis (lice infestation)?
What is the role of histology in the workup of pediculosis and pthiriasis (lice infestation)?
Treatment
How is pediculosis and pthiriasis (lice infestation) treated?
What is the role of pediculicides in the treatment of pediculosis and pthiriasis (lice infestation)?
What is the role of environmental control in the treatment of pediculosis (lice infestation)?
What are the treatment options for body lice in pediculosis and pthiriasis (lice infestation)?
What is the role of pesticides in the treatment of pediculosis and pthiriasis (lice infestation)?
What is the role of lindane in the treatment of pediculosis and pthiriasis (lice infestation)?
What is the role of spinosad in the treatment of pediculosis and pthiriasis (lice infestation)?
How are topical treatments administered for pediculosis (lice infestation)?
How is mechanical nit removal performed for pediculosis (lice infestation)?
What is the efficacy of mechanical removal in the treatment of pediculosis (lice infestation)?
What are the treatment options for pthiriasis (lice infestation)?
When is treatment indicated for sexual partners of patients with pthiriasis (lice infestation)?
How is pthiriasis (lice infestation) treated?
What are the treatment options for eyelash infestations of pthiriasis (lice infestation)?
How is pediculosis (lice infestation) re-infestation prevented?
How should children be educated on preventing the re-infestation of pediculosis (lice infestation)?
How is pthiriasis (lice infestation) prevented?
How is the re-infestation of body lice in pediculosis and pthiriasis (lice infestation) prevented?
Medications
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Nit on a hair. Note the thin, translucent cement surrounding the hair shaft. Photo courtesy of David Shum, MD Western University, London Ontario.
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Two empty nits from Pediculus humanus capitis. Note the open shells still attached to the hairs and the porous operculi through which the lice have hatched. Photo courtesy of David G. Schaus.
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Three specimens of Pediculus humanus capitis.
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Pediculus humanus corporis.
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Phthirus pubis. Note the crab-like appearance.
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The head louse, Pediculus humanus capitis, has an elongated body and narrow anterior mouthparts. Body lice look similar but lay their eggs (nits) on clothing fibers instead of hair fibers.
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The pubic louse, Pthirus pubis, is identified by its wide crablike body.