Download A4Medicine Mobile App
Empower Your RCGP AKT Journey: Master the MCQs with Us! 🚀
Head lice (Pediculus humanus capitis) are small parasitic insects that live on the human scalp and feed on blood. They are about 3mm long and can be seen with the naked eye. Head lice are not a sign of poor hygiene and can affect anyone, regardless of hair cleanliness.Head lice spread through direct head-to-head contact. They cannot jump or fly.
| Section | Information |
|---|---|
| Definition | Pediculosis refers to an infestation by lice, with symptoms often not manifesting for 3 to 4 weeks after infestation. Severity can range from a few lice (fewer than 10) to over 100 in 5% of cases and more than 1000 in severe cases. A typical infestation might involve about 30 lice per head |
| Epidemiology | Affects hundreds of millions globally. More common in children aged 4-11, with a peak at ages 7-8. It is more prevalent in girls than boys. The highest prevalence is among primary school children aged 5-12 |
| Pathology | Itching occurs upon sensitization to lice saliva, usually taking 4 to 6 weeks during first-time infestations. Secondary bacterial infections may occur in heavy infestations |
| Agent | Three types affect humans: Pediculus humanus capitis (head louse), Pthirus pubis (pubic or crab louse), and Pediculus humanus (body louse) -Lice (Phthiraptera)... |
Try our Free Plan to get the full article.
