Exam II - Dictyocaulus viviparus Flashcards
To which taxonomic family does Dictyocaulus viviparous belong?
Trichostrongylidae
What is the common name for Dictyocaulus viviparous?
lung worm
What is/are the host(s) for Dictyocaulus viviparous?
Cattle.
What is the infective stage for Dictyocaulus viviparous?
L3
Describe the appearance of Dictyocaulus viviparous adults?
Slender white worms (8 cm) in trachea and bronchi
Which life cycle stage of Dictyocaulus viviparous is found in feces?
L1
Describe the Dictyocaulus viviparous life cycle
Adult females pass eggs, which hatch to L1.
L1 coughed up and passed in feces.
L1 develop to L3, migrate up herbage
L3 ingested, migrates from intestine via blood to lungs, where it matures.
PPP is 24 days
Describe the pathogenesis & clinical signs associated with Dictyocaulus viviparous during the penetration phase
larval migration, clinical signs not apparent
Describe the pathogenesis & clinical signs associated with Dictyocaulus viviparous during the prepatent phase
larvae develop to adults in lungs.
Alveolitis & bronchitis
Describe the pathogenesis & clinical signs associated with Dictyocaulus viviparous during the patent phase
presence of adult worms in lungs. Bronchitis and pneumonia
Describe the pathogenesis & clinical signs associated with Dictyocaulus viviparous during the postpatent phase
If anima survives, recovery starts. Relapse can occur
Dissolution and aspiration of dead or dying worms at the end of a Dictyocaulus viviparous infection is referred to as:
postpatent parasitic bronchitis
How would you diagnose Dictyocaulus viviparous?
clinical signs, history, endemic area, identification of L1 with Baermann method, necropsy
Treatment & prevention options for Dictyocaulus viviparous?
anthelminthics, management, and a nifty little vaccine (only in Europe)
