K10 Introduction to Medical Entomology

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Questions and Answers

Which type of transmission involves the disease agent undergoing both developmental change and multiplication in number?

  • Cyclo-developmental transmission
  • Cyclo-propagative transmission (correct)
  • Transovarian transmission
  • Transstadial transmission

What is the characteristic of propagative transmission?

  • The disease agent is passed onto the next generation through the eggs of the insect
  • The disease agent multiplies in number only (correct)
  • The disease agent undergoes developmental change
  • The disease agent undergoes both developmental change and multiplication in number

Which of the following is an example of a disease transmitted through transstadial transmission?

  • Filaria larva in culex
  • Scrub typhus in trombiculid mite
  • Typhoid in housefly (correct)
  • Malaria parasite in Anopheles

What is the characteristic feature of Arachnida?

<p>They have 8 legs (D)</p> Signup and view all the answers

Which of the following is an example of a Myriapoda?

<p>Centipedes (C)</p> Signup and view all the answers

What is the characteristic feature of Insecta?

<p>They have 6 legs (A)</p> Signup and view all the answers

Which of the following is an example of a disease transmitted through transovarian transmission?

<p>Scrub typhus in trombiculid mite (D)</p> Signup and view all the answers

What is the characteristic feature of Crustacea?

<p>They have 10 legs (D)</p> Signup and view all the answers

What is the primary focus of Medical Entomology compared to Entomology?

<p>Study of insects of medical importance (C)</p> Signup and view all the answers

What is the term for the fear of insects?

<p>Entomophobia (D)</p> Signup and view all the answers

Which of the following is an example of mechanical transmission?

<p>Typhoid, Cholera, Dysentery by houseflies (D)</p> Signup and view all the answers

What is the term for the infestation of live tissues by fly larvae?

<p>Myiasis (C)</p> Signup and view all the answers

What is the term for the condition where a person believes they are infested with parasites?

<p>Delusional Parasitosis (DP) (D)</p> Signup and view all the answers

Which of the following is an example of direct contact transmission?

<p>Scabies by mites &amp; Pediculosis by lice (B)</p> Signup and view all the answers

What is the term for the itchy, raised patches on the skin caused by an allergic reaction to insect bites?

<p>Urticaria (Hives) (C)</p> Signup and view all the answers

Which of the following is NOT a type of negative interaction with arthropods?

<p>Photosynthesis (A)</p> Signup and view all the answers

Which of the following insects has a pair of antennae and a pair of compound eyes?

<p>Insect (C)</p> Signup and view all the answers

What is the primary function of Malphigian tubules in insects?

<p>Excretion (B)</p> Signup and view all the answers

Which of the following is NOT a type of insect?

<p>Crustacea (C)</p> Signup and view all the answers

Which of the following insects is a vector of dengue fever?

<p>Aedes aegypti (C)</p> Signup and view all the answers

What is the primary function of book-lungs in arachnids?

<p>Respiration (C)</p> Signup and view all the answers

Which of the following is a characteristic of the class Arachnida?

<p>Presence of four pairs of walking legs (D)</p> Signup and view all the answers

Which of the following is a medically important insect?

<p>All of the above (D)</p> Signup and view all the answers

Which of the following is a type of arachnid?

<p>All of the above (D)</p> Signup and view all the answers

Flashcards

Medical Entomology

The study of insects that have medical importance.

Mosquitoes

An insect that is a major cause of disease transmission.

Delusional Parasitosis

A condition where a person falsely believes they are infested with parasites.

Envenomation

Poisoning caused by the bite or sting of a venomous animal.

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Myiasis

A condition where flies infest or burrow into living tissues.

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Direct Contact Transmission

Disease transmission from person to person through direct physical contact.

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Mechanical Transmission

Disease transmission where an insect carries a pathogen without being affected itself.

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Biological Transmission

Disease transmission where a pathogen undergoes changes within the insect vector.

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Propagative Transmission

Pathogen multiplies in the insect but doesn't develop.

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Cyclo-propagative transmission

Pathogen multiplies and develops within the insect vector.

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Cyclo-developmental transmission

Pathogen develops in the insect but does not multiply.

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Transovarian transmission

Transmission from parent insect to offspring through eggs.

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Transstadial transmission

Transmission through successive life cycle stages.

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Insecta (insect)

6 legs, exoskeleton, 3 body parts, mostly terrestrial or aerial.

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Arachnida (arachnids)

8 legs, exoskeleton, 2 body parts, mostly terrestrial.

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Crustacea (crustaceans)

10 legs, exoskeleton, 2 body parts, mostly aquatic.

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Myriapoda

Many segmented legs, exoskeleton, multiple segments.

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Order Diptera

Flies

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Order Coleoptera

Beetles

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Order Siphonaptera

Fleas

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Entomophobia

Irrational fear of insects

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Study Notes

Introduction to Medical Entomology

  • Medical Entomology is a specialization of Entomology that deals with insects that are medically important.
  • Size does not matter, as mosquitoes have killed more people than any other living thing in the world.

Negative Interactions with Arthropods

  • Delusional Parasitosis (DP) and Entomophobia
  • Envenomation
  • Bites and Piercing
  • Myiasis
  • Allergic reactions
  • Urticaria (Hives)

Modes of Transmission

  • Direct contact: Arthropods are directly transmitted from man to man through close physical contact.
  • Mechanical transmission: The disease agent is mechanically carried by the arthropod.
  • Biological transmission:
    • Propagative: The disease agent multiplies in number in the body of the arthropod without undergoing developmental change.
    • Cyclo-propagative: The disease agent undergoes both developmental change and multiplies in number.
    • Cyclo-developmental: The disease agent undergoes only developmental change (no multiplication).
  • Transovarian transmission: The disease agent is passed onto the next generation through the eggs of the insect.
  • Transstadial transmission: The disease agent is passed from one stage of life cycle to another and then transmits the disease to man.

Taxonomical Classification of Arthropods

  • Arthropods:
    • Insecta (6 legs, exoskeleton, 3 body parts, mostly terrestrial and some aerial)
    • Arachnida (8 legs, exoskeleton, 2 body parts, mostly terrestrial)
    • Crustacea (10 legs, exoskeleton, 2 body parts, mostly aquatic)
    • Myriapoda (lots of legs, exoskeleton, lots of segments, mostly terrestrial)
  • Class: Insecta
    • Order: Diptera (flies), Order: Coleoptera (beetles), Order: Siphonaptera (fleas), Order: Hemiptera (true bugs), Order: Phthiraptera (lice)
    • Examples of medically important insects: mosquitoes, sandflies, tabanidae (horse fly), glossinidae (tsetse fly), muscidae (house fly), sarchophagidae (flesh fly)
  • Class: Arachnida
    • Examples: Aranea (spider), Palamnaeus (scorpion)
  • Class: Crustacea
    • Examples: ticks, mites (scabies mites, leptotrombidium sp., dermatophagoides sp., demodex folliculorum)
  • Order Acarina
    • Examples: ticks, mites

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