Vectors - Mites, Ticks, Lice And Fleas

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  • Demodex follicularum and brevis can cause dermatitis and acne in some.

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Vectors - Mites, Ticks, Lice And Fleas - Quiz
About This Quiz

Explore the role of various ectoparasites like mites, ticks, lice, and fleas in human diseases through this focused quiz. Assess your understanding of their impact on health, disease transmission, and treatment outcomes, enhancing your knowledge in parasitology and public health.

Questions and Answers
  • 2. 

    Dermatophagoides is also known as 

    • The houst dust mite

    • Tunga penetrans

    • The tropical rat flea

    • A soft tick

    Correct Answer
    A. The houst dust mite
    Explanation
    Dermatophagoides is commonly known as the house dust mite. It is a microscopic arthropod that lives in house dust and feeds on dead skin cells. House dust mites are a common cause of allergies and can trigger symptoms such as sneezing, itching, and asthma attacks in sensitive individuals.

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  • 3. 

    Pthirus pubis is a vector 

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The only louse vector is the body louse; pediculus humanis corporis.

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  • 4. 

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

    • Murine typhus

    • Russian Spring Summer Encephalitis

    • Omsk haemorrhagic fever

    • Epidemic relapsing fever (B.recurrentis)

    • Bartonella quintana

    • Bartonella bacilliformis

    Correct Answer(s)
    A. Epidemic relapsing fever (B.recurrentis)
    A. Bartonella quintana
    Explanation
    Bartonella quintana is the causative organism of trench fever. These lice also transmit Louse-borne epidemic fever (Rickettsia prowazeki).

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  • 5. 

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

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because even with treatment using doxycycline, the mortality rate of Louse-borne epidemic typhus still ranges from 1 to 20%. This means that even with medical intervention, there is still a significant risk of death associated with this disease.

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  • 6. 

    Lice are described as being dorso-ventrally rounded.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    They are dorso-ventrally flat.

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  • 7. 

    How many nymphal stages do all lice have?

    • 2

    • 3

    • None

    • 5

    Correct Answer
    A. 3
    Explanation
    All lice have three nymphal stages. Nymphs are the immature form of lice that hatch from eggs. After hatching, they go through three molts, or stages, before reaching adulthood. During each molt, the nymph sheds its exoskeleton and grows a new one. Once the lice reach adulthood, they are capable of reproducing. Therefore, the correct answer is 3.

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  • 8. 

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

    • Scutum

    • A hemimetabolous life cycle

    • Non-visible mouthparts

    • 4+ nymphal stages

    • 1 nymphal instar

    Correct Answer(s)
    A. A hemimetabolous life cycle
    A. Non-visible mouthparts
    A. 4+ nymphal stages
    Explanation
    Hard ticks have a scutum and 1 nymphal instar.

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  • 9. 

    Ornithodorous moubata transmits Borellia duttonii in East Africa.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Ornithodourous is a soft tick. It transmits tick-borne relapsing fever (caused by some Borrelia species of bacteria including duttonii and crocidurae (mostly a zoonosis in west Africa).

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  • 10. 

    The dog and cat flea has a meral rod but not pronatal or genal comb

    • True

    • False

    Correct Answer
    A. False
    Explanation
    It has both a rod and two combs. If it has no combs and just a meral rod, it is Xenopsylla cheopsis.

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  • 11. 

    Which of these species of flea can be vectors of Yersinia pestis.

    • Pulex irritans

    • Jigger flea

    • Xenopsylla cheopsis

    • Nosopsylla

    • Ctenocephalides

    • Tunga penetrans

    Correct Answer(s)
    A. Pulex irritans
    A. Xenopsylla cheopsis
    A. Nosopsylla
    Explanation
    Pulex irritans, Xenopsylla cheopsis, and Nosopsylla are all species of fleas that can act as vectors for Yersinia pestis, the bacteria that causes the bubonic plague. These fleas can become infected with the bacteria after feeding on infected rodents, such as rats, and then transmit the bacteria to humans through their bites. The bubonic plague is a highly contagious and deadly disease, and these fleas play a crucial role in its transmission.

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  • 12. 

    Fleas have no larval stages, but do have nymphal stages.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Fleas go through 3 larval instars to reach a pupal stage before adulthood.

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  • 13. 

    Tunga penetrans is a disease vector.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    It is not a vector, but does burrow into the skin of feet causing pain, itching and secondary infection. Prevention is by wearing shoes and treatment by careful removal of the flea.

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  • 14. 

    Only female fleas are blood feeders.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Both males and females are blood feeders, but the females require more.

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  • 15. 

    Leptotrombidium mites are vectors of:

    • Scrub typhus

    • Epidemic typhus

    • Endemic typhus

    • Murine typhus

    Correct Answer
    A. Scrub typhus
    Explanation
    Leptotrombidium mites are known to be vectors of scrub typhus. Scrub typhus is a disease caused by the bacterium Orientia tsutsugamushi and is transmitted to humans through the bite of infected mites. The mites acquire the bacteria by feeding on infected rodents or other animals. Scrub typhus is characterized by symptoms such as fever, headache, rash, and muscle pain. It is primarily found in rural areas of Asia, including countries like Japan, China, and India. Prompt diagnosis and appropriate treatment with antibiotics are crucial in managing scrub typhus infections.

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  • 16. 

    Orinenta tsutusugamushi is the bacterium causing:

    • Plague

    • Epidemic relapsing fever

    • Scrub typhus

    • Louse-born epidemic typhus

    Correct Answer
    A. Scrub typhus
    Explanation
    Scrub typhus is caused by the bacterium Orientia tsutsugamushi. It is a mite-borne infectious disease that is commonly found in Asia-Pacific regions. The symptoms of scrub typhus include fever, headache, muscle aches, and rash. If left untreated, it can lead to severe complications such as organ failure. Therefore, it is important to diagnose and treat scrub typhus promptly to prevent complications and ensure a full recovery.

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  • 17. 

    The chigger mite lifecycle follows the following:

    • Egg - larva - protonymph - duetonymph - tritonymph - adult

    • Egg - protonymph - tritonymph - duetonymph - larva - adult

    • Egg - tritonymph - duetonymph - protonymph - larva - adult

    • Egg - larva - adult

    Correct Answer
    A. Egg - larva - protonymph - duetonymph - tritonymph - adult
  • 18. 

    Scrub typhus can be transmitted trans-ovarially and trans-stadially.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Transovarial = from adult to egg.
    Trans-stadial = between each lifecycle stage.

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  • 19. 

    Leptotrombidium is found in Asia.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Yes mainly in forest clearnings, at river banks and grassy regions. Tend to form 'mite islands'.

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  • 20. 
    What is this: - ProProfs

    What is this:

    • Nymphal stage tick

    • Cimex aka bed bug

    • Leptotrombidium aka the chigger mite

    • Body louse

    Correct Answer
    A. Cimex aka bed bug
    Explanation
    The correct answer is Cimex aka bed bug. The given options are different types of insects or mites. The question asks to identify "this," referring to one of the options. Among the options, the bed bug is commonly known as Cimex. Therefore, the correct answer is Cimex aka bed bug.

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  • 21. 
    This is pthirus pubis. - ProProfs

    This is pthirus pubis.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    This is a scabies mite.

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  • 22. 

    An allergic reaction to the faeces and exoskeletons occurs with this:

    • Dermatopgaoides aka House Dust mite

    • Sarcoptes scabei aka Scabies

    • The Jigger flea (tunga penetrans)

    • Demodex follicularum aka the human follicle mite.

    Correct Answer
    A. Dermatopgaoides aka House Dust mite
    Explanation
    An allergic reaction to the faeces and exoskeletons occurs with Dermatopgaoides aka House Dust mite.

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  • 23. 

    Which tick can be controlled by treating livestock with acaricide.

    • Soft ticks

    • Hard ticks

    Correct Answer
    A. Hard ticks
    Explanation
    Hard ticks can be controlled by treating livestock with acaricide. Acaricides are chemicals specifically designed to kill ticks and other mites. They are commonly applied to livestock to prevent tick infestations and reduce the risk of tick-borne diseases. Treating livestock with acaricide helps to eliminate hard ticks, which are known for attaching firmly to their host's skin and causing various health issues. By targeting hard ticks with acaricide treatment, livestock owners can effectively manage tick populations and protect their animals from tick-related problems.

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  • 24. 

    Tick paralysis occurs in soft ticks

    • True

    • False

    Correct Answer
    A. False
    Explanation
    It occurs in hard ticks. Symptoms include ascending paralysis, speech, swallowing and breathing difficulties followed by death if not treated. Removing the tick quicker results in a quicker recovery.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 06, 2013
    Quiz Created by
    Andrew Blanshard

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