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Protozoa Midterm > Histomonas > Flashcards

Histomonas Flashcards

1
Q

cause

A

H. melleagridis

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2
Q

Sample and method

A

Blood smear from edge of lesion e.g liver section (can see the trophozoites)

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3
Q

Best stain for Histomonas

A

PAS!!!
Also gram-
(HE and GIEMSA are not good)

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4
Q

Diagnosis

A

The border of the necrotic area

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5
Q

What 2 forms

A

Flagellated (I think this is the trophozoite/histomonads??)

Amoeboid

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6
Q

Morph of the flagellated form

A

10-20(30)
Round or ovoid
Have 1 flagellum

CAECAL LUMEN!

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7
Q

Morph of the amoeboid form

A

8-15
Round
No flagellum
Can be pleomorphic

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8
Q

Host and vector

A

Paratenic host: young turkey
Peafowl
Guinea fowl
Turkey

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9
Q

Good cycle vs bad cycle

A

Good cycle- no death

Bad cycle-msusceptible species ingest the worms

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10
Q

Life cycle

A

Histomonads engulf cells by phagocytosis
NO CYST STAGE
Cloacal drinking

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11
Q

Clinical signs

A

Chickens: symptomless
Turkeys: 7-12 days- weakness, drowsiness, death
Sulphur yellow faeces
Maybe cyanosis in live animals, only goes black once the animal dies

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12
Q

Patho signs: caecum

A 
Caseous 
Diphtheroid pseudomembranes 
Thickened wall
Pinpoint ulcers in wall
Enlarged in turkey- amoeboid form
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13
Q

Patho signs: Liver

A

Crateriform necrotic foci
Sharp edges
Dry CS

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14
Q

Patho signs: generalised form

A

Guinea fowl
Spleen, lungs, kidneys
Wet CS

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15
Q

What causes entamoebosis

A

E. histoylitica

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16
Q

entamoebosis: diagnosis

A

Direct exam of faecal smear with Lugol’s to detect moving trophozoites

17
Q

entamoebosis: morph

A

irregular, vesicle-like nucleus

18
Q

entamoebosis: host and vector

A

human
Dog
Monkey

19
Q

entamoebosis: Clinical signs

A

Acute or chronic intestinal
Extraintestinal
Bloody and mucous Dx

20
Q

Acute intestinal:

A 
Fever 
Weakness
Loss of appetite
Emaciation
Anaema
21
Q

Chronic intestinal

A

Weight loss
Emaciation
Anaemia

22
Q

Extraintestinal

A

Peritonitis
Pleuritis
Skin ulcer
Alopecia

Protozoa Midterm (18 decks)

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