Vectors - Mites, Ticks, Lice And Fleas

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Andrew Blanshard
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1. Demodex follicularum and brevis can cause dermatitis and acne in some.

Explanation

Soap and water can treat, but sulphide creams may be required.

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

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

Explanation

Transovarial = from adult to egg.
Trans-stadial = between each lifecycle stage.

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3. Leptotrombidium is found in Asia.

Explanation

Yes mainly in forest clearnings, at river banks and grassy regions. Tend to form 'mite islands'.

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4. Only female fleas are blood feeders.

Explanation

Both males and females are blood feeders, but the females require more.

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

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. This is pthirus pubis.

Explanation

This is a scabies mite.

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7. How many nymphal stages do all lice have?

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. Lice are described as being dorso-ventrally rounded.

Explanation

They are dorso-ventrally flat.

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9. The chigger mite lifecycle follows the following:

Explanation

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10. Ornithodorous moubata transmits Borellia duttonii in East Africa.

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

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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12. Dermatophagoides is also known as 

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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13. Which tick can be controlled by treating livestock with acaricide.

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

Explanation

Fleas go through 3 larval instars to reach a pupal stage before adulthood.

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15. Pthirus pubis is a vector 

Explanation

The only louse vector is the body louse; pediculus humanis corporis.

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16. Tick paralysis occurs in soft ticks

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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17. Tunga penetrans is a disease vector.

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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18. Orinenta tsutusugamushi is the bacterium causing:

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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19. Leptotrombidium mites are vectors of:

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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20. What is this:

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

Explanation

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

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

Explanation

Hard ticks have a scutum and 1 nymphal instar.

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

Explanation

Bartonella quintana is the causative organism of trench fever. These lice also transmit Louse-borne epidemic fever (Rickettsia prowazeki).

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24. Match the vector to the disease
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25. Which of these species of flea can be vectors of Yersinia pestis.

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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Demodex follicularum and brevis can cause dermatitis and acne in some.
Scrub typhus can be transmitted trans-ovarially and trans-stadially.
Leptotrombidium is found in Asia.
Only female fleas are blood feeders.
Even when treated with doxycycline, the mortality of Louse-borne...
This is pthirus pubis.
How many nymphal stages do all lice have?
Lice are described as being dorso-ventrally rounded.
The chigger mite lifecycle follows the following:
Ornithodorous moubata transmits Borellia duttonii in East Africa.
The dog and cat flea has a meral rod but not pronatal or genal comb
Dermatophagoides is also known as 
Which tick can be controlled by treating livestock with acaricide.
Fleas have no larval stages, but do have nymphal stages.
Pthirus pubis is a vector 
Tick paralysis occurs in soft ticks
Tunga penetrans is a disease vector.
Orinenta tsutusugamushi is the bacterium causing:
Leptotrombidium mites are vectors of:
What is this:
An allergic reaction to the faeces and exoskeletons occurs with this:
Soft ticks have which of the following features. Answers may be...
The body louse is a vector of which of the following. Select all that...
Match the vector to the disease
Which of these species of flea can be vectors of Yersinia pestis.
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