CM7 : Trématodes et Cestodes
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Questions and Answers

Quelle est la maladie causée par Schistosoma haematobium ?

  • Bilharziose artério-veineuse
  • Bilharziose vésicale (correct)
  • Bilharziose intestinale
  • Bilharziose rectale
  • Quel est le mode de contamination de l'hôte définitif par Schistosoma sp. ?

  • Ingestion de larves cysticercoïdes
  • Ingestion de viande crue
  • Contact avec de l'eau douce contaminée (correct)
  • Piqûre d'un insecte vecteur
  • Les Schistosoma sp. sont présents uniquement dans les régions tropicales.

    True

    Quelle est la principale source de contamination pour l'hôte définitif par Opisthorchis felineus ?

    <p>Ingestion de viande crue</p> Signup and view all the answers

    Quels sont les hôtes intermédiaires de Trichobilharzia sp. ?

    <p>Oiseaux et escargots</p> Signup and view all the answers

    Quel est le mode de contamination de l'hôte définitif par Alaria alata ?

    <p>Ingestion d'amphibiens crus</p> Signup and view all the answers

    L'hôte définitif de Dipylidium caninum est le ______.

    <p>chien</p> Signup and view all the answers

    Quel est l'hôte intermédiaire de Anoplocephala sp. ?

    <p>Acariens oribates</p> Signup and view all the answers

    Quel est le mode de contamination de l'hôte définitif par Mesocestoïdes sp. ?

    <p>Ingestion de petits vertébrés</p> Signup and view all the answers

    Quel est l'hôte intermédiaire de Ligula intestinalis ?

    <p>Crustacé copépode</p> Signup and view all the answers

    Quel est le mode de contamination de l'hôte définitif par Davainea sp. ?

    <p>Ingestion de mollusques gastéropodes</p> Signup and view all the answers

    Le cycle de vie de Hymenolepis nana est toujours direct, sans hôtes intermédiaires.

    <p>True</p> Signup and view all the answers

    Quel est le nom du stade larvaire de Mesocestoïdes sp. ?

    <p>Tétrathyridium</p> Signup and view all the answers

    Study Notes

    Trématodes et Cestodes

    • Trematodes: Includes flatworm parasites like Opisthorchis felineus and Schistosoma sp.
    • Opisthorchis felineus: Carnivores are the definitive hosts; fish are intermediate hosts; transmission occurs through consumption of raw or undercooked fish. Humans can be infected (zoonotic).
    • Schistosoma sp.: Humans are the definitive hosts; freshwater snails are intermediate hosts; transmission occurs via skin penetration in freshwater. A major health concern, especially in tropical regions (zoonotic, highly impactful).
    • Trichobilharzia sp.: Birds are the definitive hosts; freshwater snails are intermediate hosts; skin penetration from contaminated water.
    • Austrobilharzia sp.: Birds are the definitive hosts; snails are intermediate hosts; unknown information about transmission (possibly ingestion of infected intermediate hosts).
    • Alaria alata: Canids (primarily foxes in France) are the definitive hosts; amphibians/reptiles are intermediate hosts; transmission occurs through ingestion of intermediate hosts. A potential emerging zoonotic threat.

    Cestodes

    • Anoplocephala sp.: Equids (horses and donkeys) are the definitive hosts; mites (Oribatidae) are intermediate hosts. Common in equids, significant prevalence (up to 70%) in certain areas.
    • Dipylidium caninum: Canids (dogs, cats, ferrets) are the definitive hosts; fleas are intermediate hosts. Frequent in canids, occurrence often underestimated. Transmission is through ingestion of infected fleas.
    • Mesocestoides sp.: Canids/other carnivores are the definitive hosts; arthropods followed by smaller vertebrates are the intermediate hosts. Infestation can be prevalent, but often asymptomatic.
    • Ligula intestinalis: Birds of prey are definitive hosts; copepods followed by fish are intermediate hosts; transmission occurs through ingestion of infected fish. Parasite is implicated in health problems in farmed fish.
    • Davainea sp. – Raillietina sp.: Poultry (chickens, turkeys) and pigeons are definitive hosts; mollusks or insects are intermediate hosts. Transmission by ingestion of infected intermediate hosts.
    • Hymenolepis sp.: Humans and other mammals are the primary hosts; insects are intermediate hosts in some cases. Human infection can occur by direct ingestion and is more frequent in self-infected individuals.

    General Notes

    • Ppp (Pre-patent period): Time between infection and detection of the parasite/disease in a definitive host.
    • HI (Intermediate host): Host in which a parasite develops before the definitive host.
    • HD (Definitive host): Host in which a parasite becomes sexually mature.
    • Zoonotic: Infection that can transmit from animals to humans
    • The information is derived mostly from the included source material. This is not an exhaustive list.

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    Description

    Testez vos connaissances sur les trématodes et les cestodes, deux types de parasites flatworms. Ce quiz couvre leur transmission, leurs hôtes définitifs et intermédiaires, ainsi que les maladies qu'ils peuvent causer chez l'homme et les animaux. Évaluez votre compréhension des risques associés à ces parasites.

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