W6 Nematodes Strongyloides and Trichostrongyloidea-I

Emma Gray
Quiz by , created over 3 years ago

Masters Degree Parasitology (Nematodes) Quiz on W6 Nematodes Strongyloides and Trichostrongyloidea-I, created by Emma Gray on 04/12/2016.

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Emma Gray
Created by Emma Gray over 3 years ago
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Question 1

Question
The relevant genus's of order Rhabditida include
Answer
  • Strongyloides, Rhabditis, & Micronema
  • Coccidia, Rhabditis & Ransomi
  • Pseudophyllidea & Cyclophyllidea
  • Spiruroids, Filarioids, & Enoplids

Question 2

Question
The important orders of phylum Nematoda include
Answer
  • Rhabditids & Strongylids
  • Ascarids & Oxyurids
  • Spiruroids & Filarioids
  • Enoplids
  • Pseudophyllidea & Cyclophyllidea

Question 3

Question
The following image is a parasite of order Rhabditida. Identify the following features of the worm: Corpus, Isthmus, Bulb
Answer
  • Corpus
  • Isthmus
  • Bulb

Question 4

Question
Match the following spicules with their correct species of Trichostrongylus species.
Answer
  • T. colubriformis
  • T. vitrinus
  • T. rugatus
  • T. axei
  • Barb-like tip
  • Dissimilar and unequal
  • Tapering end
  • Thick and dissimilar

Question 5

Question
These spicules belong to which species of Trichostrongylus and how would you describe their morphology?
Answer
  • T. colubriformes, with a barb like tip on the spicules
  • T. vitrinus, with a barb like tip on the spicules
  • T. rugatus, with dissimilar and unequal spicules
  • T. axei, with dissimilar and unequal spicules

Question 6

Question
The life cycle of Trichostrongylus involves a host stage, a [blank_start]dung[blank_end] stage, and a pasture stage. Dung containing worm eggs is passed from the sheep onto the pasture. At this stage eggs develop through L1 and L2 stages to the L3 stage. The L3 stage is known as the [blank_start]infective[blank_end] stage. Generally development to the infective stage is markedly reduced at temperatures below [blank_start]10˚[blank_end] and above [blank_start]35˚[blank_end]. During the pasture phase the L3 larvae migrate into [blank_start]moisture[blank_end] where they wriggle, some onto pasture, where they will then be consumed by the host. During the pasture phase the [blank_start]cuticle[blank_end] of L2 is retained by [blank_start]L3[blank_end] and acts to protect it from harsh conditions in the environment. After the L3 larvae is consumed it is [blank_start]exsheathed[blank_end] in the [blank_start]rumen[blank_end]. Infective larvae become adult that live for many months within the sheep's gut to reproduce and lay eggs. The minimum time from L3 to egg laying is [blank_start]18[blank_end] days.
Answer
  • dung
  • infective
  • 10˚
  • 35˚
  • moisture
  • cuticle
  • L3
  • exsheathed
  • rumen
  • 18

Question 7

Question
Name the strongyloid species that affect the mammalian hosts below. For example S. stercoalis is a strongyloid of dogs, cats and humans. Ruminants = [blank_start]S. papillosus[blank_end] Pigs = [blank_start]S. ransomi[blank_end] Horses = [blank_start]S. westeri[blank_end] Cat = [blank_start]S. cati[blank_end] [blank_start]Primates[blank_end] = S. fuelleborni
Answer
  • S. papillosus
  • S. ransomi
  • S. westeri
  • S. cati
  • Primates

Question 8

Question
The parasitic strongyloides are all found in the stomach, with the exception of the kangaroo species which can be found in the small intestines.
Answer
  • True
  • False

Question 9

Question
Which of the following statements is false regarding the lifecycle of S. papillosus?
Answer
  • Only female worms have been found parasitising the host
  • There is a homogonic lifecycle and a heterogonic lifecycle
  • The heterogonic lifecycle is free living and has a rhabditiform oesophagus
  • At temperatures above 34˚C the parasitic lifecycle is triggered.
  • The L1 and L2 larvae of the homogonic lifecycle have the oesophageal morphology of a filariform

Question 10

Question
Ivermectin and Oxibendazole are appropriate treatments for Strongyloides.
Answer
  • True
  • False

Question 11

Question
Which of the following techniques can be used to diagnose a strongyloid infection
Answer
  • Eggs - faecal flotation
  • Larvae - Baermann technique
  • In vitro culture
  • Serodiagnosis - ELISA
  • A streak culture on HB agar

Question 12

Question
This is the eggs of [blank_start]S. westeri[blank_end], the strongyloid of the [blank_start]horse[blank_end].
Answer
  • S. westeri
  • horse

Question 13

Question
This larva is the larvae [blank_start]S. ransomi[blank_end], it was found in colostrum. These are the strongyloides of the [blank_start]pig[blank_end].
Answer
  • S. ransomi
  • pig

Question 14

Question
The Trichostrongyles of ruminants are
Answer
  • Haemonchus
  • Ostertagia
  • Trichostrongylus
  • Cooperia
  • Nematodirus
  • Dictyocaulus
  • Faciola
  • Strongyloides

Question 15

Question
Trichostrongyles of ruminants that are found in the [blank_start]small intestine[blank_end] include; "Black scour worm" = [blank_start]Trichostrongylus[blank_end] "Wire worm" = [blank_start]Cooperia[blank_end] "Thin-necked intestinal worm" = [blank_start]Nematodirus[blank_end]
Answer
  • small intestine
  • Trichostrongylus
  • Cooperia
  • Nematodirus

Question 16

Question
Trichostrongylus species can cause the signs seen in this image.
Answer
  • True
  • False

Question 17

Question
What are the most important nematode of sheep in south-east Australia?
Answer
  • Strongyloides
  • Trichostrongylus
  • Haemonchus
  • Ostertagia

Question 18

Question
What are the main pathogenic affects of Trychostrongylus?
Answer
  • Villus atrophy
  • Pneumonia
  • Protein loss
  • Reduced absorption of Ca and PO4
  • Obesity
  • Anorexia
  • Diarrhoea
  • Abortion
  • Ulceration around the mouth and sole of the foot

Question 19

Question
Winter Rainfall Zones: - [blank_start]summer too hot and dry[blank_end] - [blank_start]autumn moist, larvae develop[blank_end] - [blank_start]winter moist, grass short[blank_end] - [blank_start]spring “flush” dilutes larvae[blank_end] - rising temperatures shorten survival time Summer Rainfall Zones - [blank_start]winter too cold or dry[blank_end] - [blank_start]larvae develop in spring[blank_end] - [blank_start]maximum numbers in summer[blank_end] Northern Hemisphere (temperate) - [blank_start]winters too cold[blank_end] - [blank_start]development occurs in spring[blank_end] - [blank_start]reaches maximum in autumn[blank_end]
Answer
  • summer too hot and dry
  • winter too cold or dry
  • winters too cold
  • summer too wet
  • autumn moist, larvae develop
  • larvae only develop in spring
  • winter moist, grass short
  • winter dry, grass short
  • winter dry, grass long
  • winter moist, grass long
  • spring “flush” dilutes larvae
  • spring "flush" increased number of larva
  • winter too cold or dry
  • summer too hot or too wet
  • larvae develop in spring
  • larvae develop in summer
  • larvae develop in winter
  • larvae develop in autumn
  • maximum numbers in summer
  • maximum numbers in spring
  • winters too cold
  • autumn too dry
  • spring too wet
  • development occurs in spring
  • development occurs only in summer
  • development occurs only in autumn
  • reaches maximum in autumn
  • reaches maximum in summer
  • reaches maximum in spring