39 Questions
What is the term used to describe the rise in egg count that occurs in spring?
Periparturient rise
What is considered a potential misconception regarding the winter strategy of hypobiosis?
Ewes lose immunity around lambing
In the nematodes life cycle, what stage comes after L4 but before the Adult stage?
L5
When does the Urquhart et al., 1996 text focus on the usefulness of fecal egg counts?
In determining when heavy infections occur
Which term describes the stage of the nematode life cycle involving mff (mature free-living) larvae?
L5
What stage of the nematode life cycle is responsible for the 'self-cure' or premonition effect mentioned?
L3 larvae
When do ewes lose immunity, leading to higher infection rates?
-2 to +8 weeks post-lambing
What is emphasized as essential for determining when and how to intervene in nematode infections?
'Understanding how the species perpetuates'
What is the primary characteristic that distinguishes nematodes from other helminths?
All of the above
How do nematode infections typically increase?
Through increased environmental exposure
Which of the following statements about nematode life cycles is correct?
Nematode life cycles can be either direct or indirect
Which of the following is NOT a method used by nematodes to ensure the survival of their species?
Asexual reproduction within the host
How does grazing impact nematode infections?
Grazing increases nematode infections by exposing animals to contaminated pastures
What is the relationship between pasture nutrition and parasite management in the context of nematode infections?
Improved pasture nutrition leads to better parasite management
Which of the following is a primary clinical sign associated with Ancylostoma caninum infections?
Anemia
How does the morphology and behavior of Ancylostoma caninum relate to its pathology and clinical signs?
Its buccal capsule and tooth-like structures facilitate blood-feeding
Which of the following is NOT a characteristic of nematodes (roundworms) mentioned in the text?
They have a segmented body structure
What is the typical life cycle stage of nematodes that is infective to the final host?
L3 (third larval stage)
What is the term used to describe the phenomenon where nematodes undergo arrested development or inhibited development to survive unfavorable conditions?
Hypobiosis
In the context of nematode life cycles, what does the term 'periparturient rise' refer to?
An increase in the number of nematode eggs or larvae around the time of giving birth
Which of the following is NOT a means of survival or transmission mentioned for nematodes?
Undergoing metamorphosis to a pupal stage
What is the term used to describe the phenomenon where nematode larvae are rapidly rejected or excluded from a host due to a previous exposure and immune response?
Immune exclusion
Which of the following statements about nematode life cycles is TRUE according to the text?
Direct life cycles involve an infective larval stage (usually L3) that is not enclosed in an egg
Which of the following statements about the immune response to nematodes in sheep is TRUE?
Hypersensitized sheep exhibit increased peristalsis of the gut to expel larvae
What is the primary mode of infection for Ancylostoma caninum?
Percutaneous
Which of the following is NOT a key characteristic of nematodes discussed in the text?
Requirement for an intermediate host
In the context of pasture management for nematode control, what does the term 'L3' refer to?
The third larval stage of the nematode life cycle
According to the information provided, how long can L3 nematode larvae survive on pastures?
A few weeks to 3+ months
What is the purpose of pasture rotations in the context of nematode control?
Both A and B
Based on the information provided, what is the approximate duration of the prepatent period (time from infection to egg shedding) for nematodes on pastures?
23 days
Which of the following statements about Ancylostoma caninum is TRUE based on the information provided?
Males have a copulatory bursa
What is the primary factor that determines the duration of pasture rotations for nematode control?
All of the above
What is the size of Ancylostomatoidea eggs?
60 x 40 m
Which nematodes are responsible for cutaneous larval migrans?
Ancylostoma caninum
What is the impact of hookworms on host animals?
Anemia and pneumonia
What is the main route of infection confirmation for hookworm disease?
Fecal examinations
Which part of the host do adult hookworms primarily infect?
Small intestine
What type of modifications are present in the buccal capsule of hookworms?
Teeth and cutting plates
Which stage of hookworms is responsible for feeding on blood?
L4 / early mature
Test your knowledge about the key characteristics, life cycles, hosts, and means of species survival of nematodes. Learn about specific nematodes like Spirocerca lupi and Ancylostoma caninum. Identify different stages from eggs to adults and understand the complexities of nematode life cycles.
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