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Parasitology > Nematodes IX: Lungworms > Flashcards

Nematodes IX: Lungworms Flashcards

1
Q

What are the definitive host of Dictyocaulus viviparus?

A

Cattle
Deer
Elk
Bison

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2
Q

What are the sites of Dictyocaulus viviparus?

A

Trachea
Bronchi
Bronchioles

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3
Q

What is the life cycle of Dictyocaulus viviparus?

A 
L1 in feces, L2
L3 ensheathed infective stage
L3 ingested alone or on Pilobolus fungus
L3 penetrates SI; mesenteric lymph node
L4 thoracic duct and right heart; lung; alveoli
\+/- ALD
Adults in lumen of bronchial tree
Eggs embryonate
L1 usually hatch in airway or GI tract
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4
Q

What is the pathology associated with Dictyocaulus viviparus?

A

Inflammation of bronchi
Collapsed alveoli
Epithelialized alveoli
Fibrotic lobes

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5
Q

What do Dictyocaulus viviparus infections in deer appear to be associated with?

A

Cross-contamination with infected domestic species

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6
Q

What are the clinical signs associated with Dictyocaulus viviparus?

A

Respiratory (chronic bronchitis, tachypnea, severe dyspnea, extended head, harsh cough)
Anorexia
Emaciation
Death

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7
Q

What is the diagnosis of Dictyocaulus viviparus?

A

Only L1 of parasitic nematides found in fresh cattle manure
L1 description: bluntly pointed tail, rounded head, granules
Technique of choice is Baermann with fresh feces

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8
Q

What are the DH of Dictyocaulus filaria?

A

Sheep

Goats

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9
Q

What are the sites of Dictyocaulus filaria?

A

Bronchi and trachea

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10
Q

What is the life cycle of Dictyocaulus filaria?

A 
L1 in feces
L2
L3 ensheathed infective stage
L3 ingested alone
L3 penetrates SI; mesenteric LN
L4 thoracic duct and right heart; lung; alveoli
\+/- ALD
Adults in lumen of bronchial tree
Eggs embryonate
L1 usually hatch in airway or GI tract
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11
Q

What is the pathology with Dictyocaulus filaria?

A

Inflammation
Catarrhal bronchitis
Atelectasis
Pneumonia

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12
Q

What is the diagnosis of Dictyocaulus filaria?

A 
L1 in fresh feces
Bluntly pointed end
Brownish intestingal granules
'Button" at mouth
Technique of choice is Baermann
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13
Q

What are the DH of Muellerius capillaris?

A

Sheep

Goats

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14
Q

What is the IH of Muellerius capillaris?

A

Gastropods (snails, slugs)

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15
Q

What is the site of Muellerius capillaris?

A

Lungs (parenchyma, bronchioles)

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16
Q

What is the life cycle of Muellerius capillaris?

A 
L1 in feces
DH ingests IH
L3 penetrates gut; mesenteric LN; heart and lungs
L4 lung parnechyma; forms nodules
Adults in nodules in lung parenchyma
Eggs in lung parenchyma
L1 hatch in lungs
Coughed up and swallowed
17
Q

What is the pathology of Muellerius capillaris?

A

Not usually pathogenic
Inflammation
Small nodular lesions

18
Q

What is the diagnosis of Muellerius capillaris?

A

L1 in feces
Tecchnique of choice is Baermann
Wavy, pointed tail with dorsal spine

19
Q

What is the DH of Aelurostrongylus abstrusus?

A

Cats

20
Q

What is the IH of Aelustrongylus abstrusus?

A

Snails

Slugs

21
Q

What is the PH of Aelustrongylus abstrusus?

A

Rodents
Birds
Amphibia
Reptiles

22
Q

What is the site of Aelustrongylus abstrusus?

A

Lung parenchyma
Terminal respirator bronchioles
Alveolar ducts; in nodules

23
Q

What is the pathology of Aelurstongylus abstrusus?

A

Subpleural nodules
Smooth muscle hypertrophy
Milky lung exudate with eggs and larvae

24
Q

What are the clinical signs of Aelurostrongylus abstrusus?

A

Respiratory

Inappetence

25
Q

What is the diagnosis of Aelurstrongylus abstrusus?

A

L1 in fresh feces
Tail curves; dorsal spine
Technique of choice is Baermann

26
Q

What is the DH of Filaroides osleri?

A

Canids, including wild canids

27
Q

What is the site of Filaroides osleri?

A

In nodules in trachea and bronchi

Rarely in lungs

28
Q

What is the life cycle of Filaroides osleri?

A

L1 and eggs in feces and saliva
DH ingests L1 or L1 in egg
Lymphatic and venous portal systems
L1, L2, L3, L4
Migrates to heart and lungs, bronchi, tracheal bifurcation
Adults in nodules in trachea and bronchi
Eggs are larvated and shed in respiratory tract

29
Q

What is the pathology of Filaroides osleri?

A

Nodules in the bifurcation of the trachea

30
Q

What is the diagnosis of Filaroides osleri?

A

L1:
Wavy tail “kinked”
No dorsal spine
ZnSO4 flotation, CANNOT DO BAERMANN because larvae are dead

Parasitology (27 decks)

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