Differences Bt. Mites & TicksSarcoptes Scabei “Morphology”.

1. Differences Bt. Mites & Ticks
House Dust Mites
Sarcoptes Scabei “Morphology”
Name: Oussama Alserwy
ID No.: 136
1

2. 1. Differences Bt. Mites & Ticks
2 I. MITES II. TICKS
1. Morphology
Size
Hypostome
Scutum
Smaller Larger
2. Life Style
Free living “some are
intermediate hosts as
Monezia in horses”
OR
Parasitic ”Sarcoptes”
Only Parasitic
“Blood feeder”
3. Life Cycle Both are hemi- metabolous

3. HOUSE DUST MITES3
• Taxonomy
 FamilyPyroglyphidae
• Main Species
 D. petronssinus
 D. farina
 D. microceras

4. 4 Dust Mites Allergens Formation
Mid-Gut
Food
particles
Hind-Gut FecalPellets
Peritrophic Membrane

5. Allergic Reactions
5
Eczema.
Br. Asthma.
Rhino-conjunctivitis.
Clinical Symptoms in Atopic
Mech.
Th2 Mediated
Immune Response
“IgE”.

6. 6 Dust Mites Asthma distribution

7. 7 Dust Mites Allergy Rx
Physical Methods
Chronic Approach
Immuno-suppressant drugs Immunotherapy “better”
Dust Mites Control
Acute Approach
Chemical Methods
Heating, drying, freezing then
vacuum cleaning
Acaricide benzyl benzoate

8. Morphology of Sarcoptes Scabei8
Eggs
Larvae
Nymphs
Adults
• Large
• Oval
• Largest
• 4 pairs of legs
• Circular
• Ventrally concave• 3 pairs of legs
Increases in size