bursate nematodes summary

Question 1

general info about strongylida

Answer 1

bursate nematodes

Question 2

4 superfamilies of the order strongylida with descriptions of all of them

Answer 2

Ancylostomatoidea (hook worms)

Trichostronngyloidea (hair worms)

strongyloidea (large ones)

metastronglyoidea (lung worms)

Question 3

Ancylostomatoidea general

Answer 3

• Buccal capsule has plates or teeth
• drink blood
• per cutaneous penetration or ingestion

Question 4

Trichostronngyloidea (hair worms) general

Answer 4

• small (7-30nm)
• absence of lead crowns
• reduced buccal capsule
• well developed bursa
• pathogenesis of abomasitis, anaemia, oedema, necrosis, diarrhoea, death etc

Question 5

Strongyloidea general

Answer 5

large buccal capsule
large intestine
infection is by ingestion of L3

Question 6

Metastrongyloidea Lung worms

Answer 6

reduced buccal capsule and bursa
adults in lung tissue or surrounding blood vessels
most need intermediate host eg mollusk

Question 7

list the ancylostomatoidea sp

Answer 7

ancyclostoma caninum (hookworm)

Question 8

list Trichostrongyloidea sp

Answer 8

Ostertagia ostertagi
Haemonchus contortus
trichostrongylus spp
Dictyocaulus spp

Question 9

list strongyloidea species

Answer 9

strongylus vulgaris (large)
cythostomes (small)

Question 10

list metastrongyloidea spp

Answer 10

Angiostrongylus cantonensis (rat lungworm but in lots more species)
aelurostrongylus abstrusus ( cat lungworm)

Question 11

ancyclostoma caninum

Answer 11

hookworm, ancylostomatoidea
ingested by dog –> floors tracheal migrations to SI
larvae development arrest in muscles

Question 12

Ostertagia ostertagi

Answer 12

Trichostrongylodiea
small brown stomach worms
cattle
increased infection in winter and spring
causes reduced food intake and diarrhoea
located in abomasum

Question 13

Haemonchus contortus

Answer 13

baraber's pole worm
sheep and cattle
Trichostrongyloidea
abomasum
blood suckers, no diarrhoea, highly pathogenic
bottle jaw

Question 14

Trichostronglus spp

Answer 14

black scour worms
trichostrongyloidea
mostly SI some in abomasum
winter and summer rainfall area

Question 15

Dictyocaulus spp

Answer 15

lung worms
trichostrongyloidea
adults in bronchial tree
3-10cm long thread like
eggs hatch in lungs –> L1 passed in faeces –> L3 ingested
partial tracheal migration
coughing, respiratory signs and ill thrift

Question 16

Strongylus vulgaris

Answer 16

Large strongyles
strongyloidea
horses
2-4.5 cm, red worms
caecum and large colon
suck blood

Question 17

Cyathostomes

Answer 17

small strongyles
Strongyloidea
smaller
rain encrypted for longer and as El3s
are anthelmintic resistance

Question 18

angiostrongylus cantonensis

Answer 18

rat lung worm
metastrongyloidea
also humans, dogs, horses, flying and marsupials
in intermediate host undergoes period of CNS Migration
accidental hosts = servers neuro disease

Question 19

Aelurostrongylus abstrusus

Answer 19

cat lung worm
coughing, wasting , shortness of breath
1 cm
needs mollusc intermediate host

Question 20

ancylostomata caninum life cycle

Answer 20

egg, L1 and L2 in faeces
L3 is infectious stage
enter host via oral entry, percutaneous, predation
L4 goes through tissue (larval arrest) and tracheal migration
Adult in SI

Question 21

Dictyoculus spp life cycle

Answer 21

L3 penetrates SI

L4 in the lymphatics –> blood –> lungs –> capillaries to alveoli –> moult into adults

Question 22

Strongylud vulgaris life cycle

Answer 22

L3 ingestion, penetrates gut –> into cranial mesenteric arteries (develop here for 3-4 mths –> Immature adults go back to caecum and large intestine