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
Correct Answer
A. TrueExplanation
Soap and water can treat, but sulphide creams may be required.Rate this question:
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- 2.
Dermatophagoides is also known as
- A.
The houst dust mite
- B.
Tunga penetrans
- C.
The tropical rat flea
- D.
A soft tick
Correct Answer
A. The houst dust miteExplanation
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.Rate this question:
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- 3.
Pthirus pubis is a vector
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The only louse vector is the body louse; pediculus humanis corporis.Rate this question:
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- 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
Correct Answer(s)
D. Epidemic relapsing fever (B.recurrentis)
E. Bartonella quintanaExplanation
Bartonella quintana is the causative organism of trench fever. These lice also transmit Louse-borne epidemic fever (Rickettsia prowazeki).Rate this question:
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- 5.
Even when treated with doxycycline, the mortality of Louse-borne epidemic typhus is between 1 and 20%?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 6.
Lice are described as being dorso-ventrally rounded.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
They are dorso-ventrally flat.Rate this question:
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- 7.
How many nymphal stages do all lice have?
- A.
2
- B.
3
- C.
None
- D.
5
Correct Answer
B. 3Explanation
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.Rate this question:
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- 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
Correct Answer(s)
B. A hemimetabolous life cycle
C. Non-visible mouthparts
D. 4+ nymphal stagesExplanation
Hard ticks have a scutum and 1 nymphal instar.Rate this question:
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- 9.
Ornithodorous moubata transmits Borellia duttonii in East Africa.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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).Rate this question:
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- 10.
The dog and cat flea has a meral rod but not pronatal or genal comb
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
It has both a rod and two combs. If it has no combs and just a meral rod, it is Xenopsylla cheopsis.Rate this question:
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- 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
Correct Answer(s)
A. Pulex irritans
C. Xenopsylla cheopsis
D. NosopsyllaExplanation
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.Rate this question:
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- 12.
Fleas have no larval stages, but do have nymphal stages.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Fleas go through 3 larval instars to reach a pupal stage before adulthood.Rate this question:
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- 13.
Tunga penetrans is a disease vector.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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- 14.
Only female fleas are blood feeders.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Both males and females are blood feeders, but the females require more.Rate this question:
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- 15.
Leptotrombidium mites are vectors of:
- A.
Scrub typhus
- B.
Epidemic typhus
- C.
Endemic typhus
- D.
Murine typhus
Correct Answer
A. Scrub typhusExplanation
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.Rate this question:
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- 16.
Orinenta tsutusugamushi is the bacterium causing:
- A.
Plague
- B.
Epidemic relapsing fever
- C.
Scrub typhus
- D.
Louse-born epidemic typhus
Correct Answer
C. Scrub typhusExplanation
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.Rate this question:
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- 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
Correct Answer
A. Egg - larva - protonymph - duetonymph - tritonymph - adult -
- 18.
Scrub typhus can be transmitted trans-ovarially and trans-stadially.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Transovarial = from adult to egg.
Trans-stadial = between each lifecycle stage.Rate this question:
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- 19.
Leptotrombidium is found in Asia.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Yes mainly in forest clearnings, at river banks and grassy regions. Tend to form 'mite islands'.Rate this question:
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- 20.
What is this:
- A.
Nymphal stage tick
- B.
Cimex aka bed bug
- C.
Leptotrombidium aka the chigger mite
- D.
Body louse
Correct Answer
B. Cimex aka bed bugExplanation
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.Rate this question:
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- 21.
This is pthirus pubis.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
This is a scabies mite.Rate this question:
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- 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.
Correct Answer
A. Dermatopgaoides aka House Dust miteExplanation
An allergic reaction to the faeces and exoskeletons occurs with Dermatopgaoides aka House Dust mite.Rate this question:
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- 23.
Which tick can be controlled by treating livestock with acaricide.
- A.
Soft ticks
- B.
Hard ticks
Correct Answer
B. Hard ticksExplanation
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.Rate this question:
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- 24.
Tick paralysis occurs in soft ticks
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
ProProfs Editorial Team -
Dec 06, 2013Quiz Created by
Andrew Blanshard