Parasitology Flashcards
What are arthropods broken into? what are the differences?
Arachnids (4 pairs) > mites, ticks and insects (3 pairs) lice, flies, fleas
Describe the characteristics of ticks
- Temporary parasite
- Incomplete metamorphosis
- 4 pairs of legs (larva have 3 pairs)
- 3 host tick
- life span 3-5 yrs
What are some common tick borne diseases for farm animals?
- Tick-borne fever
- Redwater fever (cattle, red urine from result of haemoglobin)
- Louping ill (sheep)
Describe the characteristics of mites
- 4 pairs of legs
- Permanently on host
- Transmit via direct contact
- Pathogenesis due to damage to epidermis, hypersensitivity and 2ndary infections.
What is psoroptic mange?
- Cause by non burrowing mite
- Zoonotic and notifiable
- Mites feed on cells, bacteria and lymp »_space; pruritic»_space; 2ndary infections
What are the physical differences between the burrowing vs non burrowing mite?
Burrowing: circular body, short legs
Non burrowing: oval body, long legs
What is the epidemiology of psoroptic mange?
- Population can double every 6 days
- Distribution varies by season
- Caused by psoroptes ovis
What is dermanyssus?
The red poultry mite.
- main ectoparasite of laying birds
- Nocturnal feeders
How does dermanyssus effect birds?
- Skin irritation/aggression
- Anaemia
- Lower egg production
- Mortality in newly hatched chickens
What is PGE? What/who does it effect?
Parasitic gastroenteritis > caused by several nematode spp, mostly lambs and calves > effects abomasum and SI.
What is parasitic bronchitis?
Cattle lungworm
What are the CS of PGE?
Loss of serum protein (bottle jaw), anaemia, diarrhoea, loss of appetite
What is the symbiotic relationship with parasitic bronchitis?
With the fungus pilobolus
What is fasciola hepatica?
Liver fluke
How can parasitic worms be diagnosed?
- Floatation
- Sedimentation
- Barmann method
- Meat inspection
