B2. Ectoparasites 1H

Question 1

What is pedicures humanus ?

Answer 1

Lice

Question 2

Are lice contagious ?

Answer 2

Yes , highly contagious can travel quickly

Question 3

How long can they persist ?

Answer 3

> 1 year if untreated

Question 4

What are the three types of lice ?

Answer 4

Head
Body
Pubic

All have different shapes

Question 5

What are they symptoms of head lice ?

Answer 5

Itching
Difficulty sleeping
Scratching
Often bumps on neck

Question 6

How would you diagnose lice?

Answer 6

Visual inspection

• Scalp
• comb

Question 7

Who is more at risk of lice ?

Answer 7

Girls since they have lingers hair

Sharing of brushes combs hats

Question 8

What are the pharmaceutical treatments for lice ?

Answer 8

1. Dimeticone lotion 4%
2. Malathion lotion 0.5%
3. Benzoyl alcohol emulsion 25%
4. lindane shampoo 1% but band due to neurological damage

Question 9

How does dimeticone work ?

Answer 9

Silicone based and forms water impervious coat if silicone on lice (suffocate lice)

Question 10

What is lindane ?

Answer 10

Gamma-hexachlorocyclohexane

Which is an example of ion channel antagonist

Question 11

How is lindane a toxin ?

Answer 11

Binds to and inhibits GABAa chloride channel complex
- acts at picrotoxin binding site

Heightening of electical activity

Question 12

What is the prophylaxis of lice ?

Answer 12

Wet comb