Vectors - Mites, Ticks, Lice And Fleas

25 Questions | Total Attempts: 569

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Vectors - Mites, Ticks, Lice And Fleas

Questions and Answers
  • 1. 
    Demodex follicularum and brevis can cause dermatitis and acne in some.
    • A. 

      True

    • B. 

      False

  • 2. 
    Dermatophagoides is also known as 
    • A. 

      The houst dust mite

    • B. 

      Tunga penetrans

    • C. 

      The tropical rat flea

    • D. 

      A soft tick

  • 3. 
    Pthirus pubis is a vector 
    • A. 

      True

    • B. 

      False

  • 4. 
    The body louse is a vector of which of the following. Select all that apply.
    • A. 

      Murine typhus

    • B. 

      Russian Spring Summer Encephalitis

    • C. 

      Omsk haemorrhagic fever

    • D. 

      Epidemic relapsing fever (B.recurrentis)

    • E. 

      Bartonella quintana

    • F. 

      Bartonella bacilliformis

  • 5. 
    Even when treated with doxycycline, the mortality of Louse-borne epidemic typhus is between 1 and 20%?
    • A. 

      True

    • B. 

      False

  • 6. 
    Lice are described as being dorso-ventrally rounded.
    • A. 

      True

    • B. 

      False

  • 7. 
    How many nymphal stages do all lice have?
    • A. 

      2

    • B. 

      3

    • C. 

      None

    • D. 

      5

  • 8. 
    Soft ticks have which of the following features. Answers may be multiple.
    • A. 

      Scutum

    • B. 

      A hemimetabolous life cycle

    • C. 

      Non-visible mouthparts

    • D. 

      4+ nymphal stages

    • E. 

      1 nymphal instar

  • 9. 
    Ornithodorous moubata transmits Borellia duttonii in East Africa.
    • A. 

      True

    • B. 

      False

  • 10. 
    The dog and cat flea has a meral rod but not pronatal or genal comb
    • A. 

      True

    • B. 

      False

  • 11. 
    Which of these species of flea can be vectors of Yersinia pestis.
    • A. 

      Pulex irritans

    • B. 

      Jigger flea

    • C. 

      Xenopsylla cheopsis

    • D. 

      Nosopsylla

    • E. 

      Ctenocephalides

    • F. 

      Tunga penetrans

  • 12. 
    Fleas have no larval stages, but do have nymphal stages.
    • A. 

      True

    • B. 

      False

  • 13. 
    Tunga penetrans is a disease vector.
    • A. 

      True

    • B. 

      False

  • 14. 
    Only female fleas are blood feeders.
    • A. 

      True

    • B. 

      False

  • 15. 
    Leptotrombidium mites are vectors of:
    • A. 

      Scrub typhus

    • B. 

      Epidemic typhus

    • C. 

      Endemic typhus

    • D. 

      Murine typhus

  • 16. 
    Orinenta tsutusugamushi is the bacterium causing:
    • A. 

      Plague

    • B. 

      Epidemic relapsing fever

    • C. 

      Scrub typhus

    • D. 

      Louse-born epidemic typhus

  • 17. 
    The chigger mite lifecycle follows the following:
    • A. 

      Egg - larva - protonymph - duetonymph - tritonymph - adult

    • B. 

      Egg - protonymph - tritonymph - duetonymph - larva - adult

    • C. 

      Egg - tritonymph - duetonymph - protonymph - larva - adult

    • D. 

      Egg - larva - adult

  • 18. 
    Scrub typhus can be transmitted trans-ovarially and trans-stadially.
    • A. 

      True

    • B. 

      False

  • 19. 
    Leptotrombidium is found in Asia.
    • A. 

      True

    • B. 

      False

  • 20. 
    What is this:
    • A. 

      Nymphal stage tick

    • B. 

      Cimex aka bed bug

    • C. 

      Leptotrombidium aka the chigger mite

    • D. 

      Body louse

  • 21. 
    This is pthirus pubis.
    • A. 

      True

    • B. 

      False

  • 22. 
    An allergic reaction to the faeces and exoskeletons occurs with this:
    • A. 

      Dermatopgaoides aka House Dust mite

    • B. 

      Sarcoptes scabei aka Scabies

    • C. 

      The Jigger flea (tunga penetrans)

    • D. 

      Demodex follicularum aka the human follicle mite.

  • 23. 
    Which tick can be controlled by treating livestock with acaricide.
    • A. 

      Soft ticks

    • B. 

      Hard ticks

  • 24. 
    Tick paralysis occurs in soft ticks
    • A. 

      True

    • B. 

      False

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