Sarcoptes scabiei Mite Worldwide distribution In all socio-economic classes Contagious ectoparasitic infestation Affects only man Obligate human parasite Generalized itching Vesicular / pustular rash Superficial burrows Treatment- Ivermectin Sulphur Benzoyl benzoate cream

1. z SCABIES

2. z
A disease caused by a parasite
( A mite)

3. z

4. z
Clinical features
 Generalized itching
 Vesicular / pustular rash
 Superficial burrows

5. z

6. z
Differential diagnoses
Adults
 Chicken pox
 Lepromatous leprosy
 Onchocerciasis
Neonates
 Eczema
 Pempigus
 Pyoderma

7. z
Sarcoptes scabiei var. hominis
Caused by a mite;

8. z
Disease transmission
 Direct skin contact
 Sharing of clothes, bed, bed linen etc
 Sexual contact

9. z

10. z
About scabies
 Worldwide distribution
 In all socio-economic classes
 Contagious ectoparasitic infestation
 Affects only man
 Obligate human parasite

11. z
Zoonotic scabies
 Seen in dogs, cats, horses etc
 Rarely transmitted to humans
 Can be differentiated from human scabies by
 - distribution of the rash
 - absence of borrows in hand

12. z
Life cycle stages of the mite
 Eggs
 Larvae
 Nymph
 Adult (M&F)

13. z
Life cycle
 Female mite mates with female mite in the burrow.
 Female mite lays eggs and faeces in the burrows
 Eggs hatch
 Larvae are released
 They come out of the burrow, on to the skin surface
 Then forms new moulting pouches upto straitum corneum
 Larvae moults Into nymph
 The live in molting pouches and become adults
 Female remains in the burrow, while the male go out

14. z
Life cycle

15. z

16. z
Skin Burrows
 Visible torturous sepentine like lines over the skin
 The mite digs into the superfial skin and reside there
 Never go beyond striatum corneum
 Mainly at night

17. z
Pathogenesis
 Adult mite, eggs, faeces in skin burrows trigger host
immune system.
 Local itching, scratching, vesicles become
pustules, generalised itching, hypersensitivity
 Larvae on skin can be transmitted to another
person by direct or indirect contact

18. z
Preferred body sites
Areas that are thin and
wrinkled
 Finger webs
 Wrist
 Elbow, knee
 Axilla, scrotum
 Breast , nipple
 Buttocks
 Feet
 Around umbilicus

19. z
Treatment
 Ivermectin
 Sulphur
 Benzoyl benzoate cream

20. z
Prevention
 No cloth, bed , bed linen sharing
 Personal hygiene

21. z
Other types of scabies
 Neonatal scabies
 Crusted scabies in the immunocompromised

22. z
Crusted scabies
 Seen in the immunocompromised
 Also called Norwegian scabies
 No burrows
 Profuse crushing, hyperkeratotic plaques
 Severe from of scabies
 A large number of mites present on skin surface

23. z
Neonatal scabies
 Over the first year
 Buttocks, perineum common
 Burrows impossible to find
 2ry pustules, pyoderma