Relationships in Medical Parasitology: Commensalism, Parasitism, and Mutualism
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Questions and Answers

What is the role of a paratenic host in the transmission of infectious agents?

  • Harbors the parasite and serves as a source of infection to other hosts
  • Directly infects the definitive host
  • Assists in the transfer of parasitic forms between hosts but is not essential in the parasite's life cycle (correct)
  • Transfers the infective stage of parasites to humans
  • In Taeniasis, which species are considered the definitive host?

  • Pigs
  • Cattle
  • Snails
  • Humans (correct)
  • Which of the following animals serves as a reservoir of Balantidium coli?

  • Cats
  • Wild boars
  • Pigs (correct)
  • Field rats
  • What type of vector develops or multiplies the infecting organism before transmitting it to another individual?

    <p>Biological vector</p> Signup and view all the answers

    What term describes organisms that cannot live without a host?

    <p>Obligate parasite</p> Signup and view all the answers

    Which of the following describes organisms that attack an unusual host?

    <p>Accidental/Incidental parasite</p> Signup and view all the answers

    Where does the larval or asexual stage of a parasite typically reside?

    <p>Intermediate host</p> Signup and view all the answers

    Which term is used to describe a free-living organism that passes through the gastrointestinal tract without infecting the host?

    <p>Spurious parasite</p> Signup and view all the answers

    Which type of relationship is commensalism based on?

    <p>One organism benefits, the other is unaffected</p> Signup and view all the answers

    Which parasite derives benefits without causing any injury to the host?

    <p>Entamoeba histolytica</p> Signup and view all the answers

    What is the most common portal of entry for parasites?

    <p>Oral ingestion</p> Signup and view all the answers

    Which parasite may be transmitted through mother's milk?

    <p>Toxoplasma gondii</p> Signup and view all the answers

    Which parasite causes amebic dysentery?

    <p>Entamoeba histolytica</p> Signup and view all the answers

    Which host serves as an intermediate host for filarial nematodes?

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

    Which parasite competes with the host for Vitamin B12?

    <p>Entamoeba histolytica</p> Signup and view all the answers

    What type of damage does traumatic damage cause to the tissues affected?

    <p>Lytic necrosis</p> Signup and view all the answers

    Which parasite secretes lytic enzymes that lyses tissues?

    <p>Entamoeba histolytica</p> Signup and view all the answers

    Which parasite may provoke cellular proliferation and infiltration at the site of their location?

    <p>Plasmodium species</p> Signup and view all the answers

    Which host serves as an intermediate host for Trypanosoma cruzi?

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

    Which parasite causes Leishmaniasis?

    <p>Leishmania species</p> Signup and view all the answers

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