Nematodirus Battus Flashcards
What species is mainly affected by Nematodirus battus?
Affects lambs mainly
Where are adult nematodirus battus species found?
Small intestine
Describe the n.battus morphology?
2cm long Often found in groups like tangled cotton wool Cephalic vesicle- bubble at head end Males have thin spicules Females have large eggs within uterus
How can you distinguish cooperia and nematodirus?
Nematodirus males have long thin spicules
Cooperia males have short spicules
Cooperia coiled ‘watch spring’
Nematodirus cotton wool
How can eggs of nematodirus and trichostronglye be distinguished?
Size- nematodirus eggs larger
150um telodorsagia 90Um
Brown staining to namatodirus, telodorsagia clear
Nematodes parallel sides, others more oval
Describe the lifecycle of a nematodirus battus?
Unembryonated egg shed onto pasture Develop to L1- L3 develops in egg then hatches L3 ingested L3 to L4 in lumen of SI L4 burrows into SI mucosa L4 to L5 L5 emerges and mature in SI
What is the peri patent period of nematodirus battus?
15 days
What is the pathology of nematodirus battus?
Developing L5 destroy mucosa
Catarrhal enteritis
Villous atrophy
Fluid and nutrient absorption disrupted
How many worms are needed to cause clinical disease?
2000 worms
When does L3 develop?
Develops in egg over summer
At what stage does N battus over winter?
Larvated egg
What specific hatching requirements do N battus require?
Exposure to prolonged period of chill
Exposure to mean day/night temp of 10 degrees
When does emergence en masse occur?
Spring
What is needed for the disease to occur?
Hatching coinciding with presence of susceptible lambs
Old enough to graze before immunity develops
What are the clinical signs?
Sudden explosive outbreak or acute watery diarrhoea
Inappetence, dehydration, abdominal pain, weight loss
