Nematodes Flashcards
- key characteristics - direct or indirect life cycle? - identify types of hosts in a life cycle - identify methods used to ensure the survival of their species - Ancylostoma caninum - primary clinical signs - primary modes of infection - relate morphology & behavior to pathology and clinical signs
1
Q
Phylum Nematoda
A
roundworms
2
Q
live extracellularly
A
in the GI-tract and organs
3
Q
sexual reproduction
A
- nematodes: males and females
4
Q
oviparous
A
egg-laying
5
Q
vivparous
A
lay live young
6
Q
Nematodes (roundworms)
A
- free-living or parasitic
- soil, plant, animal nematodes
- elongate/cyndrical
- alimentary canal present
- sexes usually separate
- life cycle: direct or indirect
7
Q
alimentary canal
A
?
8
Q
key characteristics
A
??
9
Q
life cycle
A
E - L1 - L2 - L3 - L4 - L5 - Adult
- L1 = mff; L5 = immature adult
- insert host(s)
10
Q
direct life cycle
A
- infective larva (usually L3)
- infective larva in an egg (usually L2)
11
Q
indirect life cycle
A
- L1 infective to intermediate host
- L3 to the final host
12
Q
how they ensure offspring get in a host
A
- periparturient rise
- survival of eggs with larva
- paratenic hosts
- transmammary, transplacental
- avoid immune system/bad weather
- arrested development (hypobiosis)
13
Q
Ancylostoma caninum
A
- round; elongated; males and females
- buccal cavity: teeth
- size: 1-2 cm
- bursa: yes
- host: caninum -> dogs
- mode of infection: many modes
- predilection site: adult small intestines; larvae migrate in lungs
- food: adults blood
- life cycle: direct
14
Q
Ancylostoma caninum - direct life cycle
A
- 5 modes of infection
1. percutaneous or penetration of oral mucosa
2. per os
3. paratenic hosts (rodents)
4. transplacental (rare)
5 transmammary (important) - arrested development
- lung migration
