Lab 19 Ticks & mites

1. Lab 19Ticks & mites

2. C. Order: Acari (Acarina) • The segmentation is not clear on the body. • Larvae with 3 pairs of legs, nymph and adult • with four. • Classified on base of breathing spiracles. • Generally divided into: • 1. Ticks 2. Mites

3. 2. Ixodidae (hard tick): • Mouth parts protrude in • the front, not under the body. • In Iraq we have several • genera and species. • Most of which parasitize • cattle, sheep, goats, doges and • other carnivorous. • They are vectors of protozoa • (babasia), rickettsia (tick • typhus), viruses (Arboviruses, • RSSF= Russian summer spring • fever), and spirochaetes (lyme • disease).

5. HARD TICKS

7. Ticks: • Argasidae(soft tick): • Orthodorosmoubata, Tholozane, . • Mouth parts not protruded forward, • under body. • Main vectors of endemic • relapsing fever.

8. Mites: • very small to microscopic. • No hypostome, • feed by different ways. • Only one rickettsial disease is known to be transmitted by chigger mite. • Mites can cause itching, inflammation and rash (scabies). • There are eight families, • many of which feed on plants and other feeds on poultry, mammals or man Chigger’s mite Chigger’s mite bite

10. Scabies: Sarcoptesscabiei

11. Cross sectional view of the burrows created in the epithelium by Sarcoptesscabei

12. Mites burrowing under the skin cause a rash, • which is most frequently found on the hands,

14. HOUSE DUST MITE

15. Lab 19 class: insecta

16. IV. Class Insecta: • Very important vectors. • Three body regions, • Three pairs of legs. • Most insects are winged. • Undergo metamorphoses. • Four important orders: • 1. Order: Hemiptera (نصفية الاجنحه): • A. Family: Cincidae: non vector, • but annoying….. • (Bed bug). Feeding bedbug

17. 2. Family:Reduviidae: vectors of chagas disease. Triatomine bug (assassin bug)

18. Lice

19. Order: Anoplura [sucking lice, القمل الماص] • Two genes of lice infest humans: Pediculus • humanus capitis (head louse), Pediculus • humanus corporis (body louse) and Phthirus • pubis (crab louse, pubic louse). • Lice are dorsoventrally flattened insects,about 1.5–4mm in length, wingless, with reduced eyes, • Short (five-segmented)antennae, piercing and • sucking mouthparts, and strong claws designed to • cling to hairs.

20. It transmitted mainly via: • head-to-head contact. • Less commonly, via fomites (such as hats, scarves, coats, sports uniforms, or hair ribbons).

21. Pubic lice are transmitted from person to person most-commonly via: • sexual contact, • fomites (bedding, clothing) may play a minor role in their transmission.

22. 2. Order: Anoplura (القمل الماص):Pediculus • vector of epidemic • typhus and relapsing • fever.

23. Eggs (called nits) are laid on hair shafts and • are held tightly by cement like substance, • making them difficult to remove. • Lice remainon a host permanently; • Both males and females are hematophagous • and requirefrequent blood meals.

25. Phylum: Arthropoda • IV. Class Insecta: • 2. Order: Anoplura (القمل الماص): • Pediculus spp. قملة الجسم • Eggs (Nits)

26. Pediculushumanuscapitis(head louse adult)

27. Phthirus pubis (crab louse, pubic louse)

28. Lice Lice, pediculus humanus Var. capitis, head louse and phthirus pubes, crab louse

29. 3. Order: Siphonoptera (fleas): • vectors of plaque and • endemic typhus.

30. Insecta: Flea

31. 4. Order: Diptera: ثنائية الاجنحه: • one pairs of wings • many important families, • i.e. mosquitoes, sand flies, • common flies……etc.