What are the two main families of lungworm in ruminants?
Trichostrongyloidea and Metastronglyoidea
Does trichostronglyoidea have a direct/indirect lifecycle?
Why family (trichostronglyoidea or metastrongyloidea) is pathogenic?
Does metastronglyoidea have a direct/indirect lifecycle?
What disease does trichostronglyoidea lungworms cause?
Parasitic bronchitis (husk)
What are the different trichostrongyloidea species for the following animals? a) Cattle b) Horse and donkey c) sheep and goats e) deer and other cervids?
a) Dictyocaulus viviparus b) Dictyocaulus arnfieldic) Dictyocaulus filaria
d) Dictyocaulus eckerti
Describe the lifecycle of Dictyocaulus viviparus
L1 is excreted in faeces --> L2 --> Infective L3 on pasture ingested and penetrate intestinal mucosa (Pilobolus fungus aids dispersal of L3s) --> L4 in mesenteric lymph nodes --> Lymphovascular route to lungs --> young adults in bronchioles and small bronchi --> Adult worms in main stem bronchi/trachea --> Eggs hatch in lungs and L1 migrate up to trachea and swallowed
PPP = 26 days
How do animals develop good natural immunity to Dictyocaulus viviparus?
Cattle gain strong immunity following infection (it only takes one infection for cattle to become immune)
What are the clinical signs of Parasitic bronchitis?