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3rd Year Protozoology > Sarcocystis > Flashcards

Sarcocystis Flashcards

1
Q

In Sarcocystis sp., where does sexual reproduction take place?

A

Definitive host

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2
Q

What is the end product of sporogony in the definitive host of Sarcocystis sp.?

A

Fully sporulated oocysts and sporocysts

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3
Q

Infective stage of Sarcocystis sp occurs in what area of definitive host

A

intestinal mucosa

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4
Q

Etiologic agents of Sarcosporidiosis in sheep

A

Sarcocystis ovicanis
Sarcocystis arieticanis

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5
Q

Etiologic agents of Sarcosporidiosis in goats

A

Sarcocystis capracanis
Sarcocystis hircicanis

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6
Q

Causes a severe neurological disease in
horses called Equine Protozoal Encephalomyelitis (EPM)

A

Sarcocystis neurona

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7
Q

Predilection site of Besnoitia sp.

A

Connective tissue of the skin

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8
Q

Definitive host of Besnoitia spp

A

Cats

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9
Q

IH of Besnoitia spp

A

Horses, ruminants, rodents, lizards

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10
Q

Etiologic agent of cutaneous form of Besnoitiosis in horses and burros which cause widespread, serious dermatitis

A

Besnoitia bennetti

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11
Q

Manifestations of Besnoitia besnoiti in cattle

A
  1. Swelling of the lymph nodes
  2. Subcutaneous swellings
  3. Diarrhea
  4. Abortion
  5. Infertility
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12
Q

Which Besnoitia spp has IH of reindeers?

A

Besnoitia tarandi

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13
Q

Lichenification of the muzzle is a symptom of Besnoitiosis of which domestic animals?

A

Cattle

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14
Q

Etiologic agent of bovine besnoitosis

A

Besnoitia besnoiti

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15
Q

Chronic cutaneous Besnoitia infection in cow is referred to as?

A

Scleroderma or elephant hide disease

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16
Q

Oocysts are virtually indistinguishable from those of toxoplasma and neospora

A

Hammondia sp.

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17
Q

Definitive host of Hammondia hammondi

A

Cats

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18
Q

Give at least 3 IH of Hammondia hammondi

A

pigs, rats, mice, goats, hamsters, dogs

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19
Q

DH of Hammondia heydorni

A

Dogs and foxes

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20
Q

IH of H. heydorni

A

Ruminants, guinea, pigs, dogs

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21
Q

What life cycle stage of Hammondia sp. from cat feces is infectious to rats?

A

Sporulated oocysts

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22
Q

Which life cycle stage of Hammondia sp. from mouse tissue is infectious to cats?

A

Bradyzoites

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23
Q

A parasite of the renal epithelium of
horses

A

Klossiella equi

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24
Q

A parasite of the renal epithelium
of the mouse

A

Klossiella muris

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25
Transmission of mouse coccidia occurs via ingestion of sporulated oocysts passed in?
Urine
26
IH of Toxoplasma
Warm blooded animals
27
Known as the enteric coccidian of the domestic cats, which are the only known definitive hosts
Toxoplasma
28
Which form of toxoplasma has a banana shape?
Trophozoites (Tachyzoites)
29
Which form of toxoplasma contain zoites or bradyzoites found in internal organs of vertebrate host?
Pseudocyst or cyst
30
Which form of toxoplasma is produced after schizogony, gametogony and syngamy in the intestines of cats, followed by sporulation in the ground upon fecal expulsion?
Oocysts
31
Seen in body fluids in early, acute infection: a. Tachyzoites b. Bradyzoites
Tachyzoites
32
Released from ruptured tissue cysts that cause inflammation and block vessels and necrosis a. Tachyzoites b. Bradyzoites
Bradyzoites
33
Has slow dividing stage: a. Tachyzoites b. Bradyzoites
Bradyzoites
34
Contained in cysts in muscles and brain tissue and eyes: a. Tachyzoites b. Bradyzoites
Bradyzoites
35
Hass rapid dividing stage: a. Tachyzoites b. Bradyzoites
Tachyzoites
36
Destroy cells specifically parenchymal and reticuloendothelial cells: a. Tachyzoites b. Bradyzoites
Tachyzoites
37
True or False: Development of Sarcocystis sp. occurs in the external environment.
False
38
In the definitive host of Sarcocystis sp., what process occurs in the intestinal mucosae?
Sporogony
39
What is the infective stage of Sarcocystis sp. for the next host?
Sporocysts
40
In the intermediate host of Sarcocystis sp., which two processes occur?
Schizogony and sarcocyst (Meischer's tube) formation
41
What is another name for the sarcocyst stage in the intermediate host?
Meischer's tube
42
What are the cells found within the sarcocyst in the intermediate host called?
Bradyzoites or Rainey’s corpuscles
43
What type of substance is secreted by the sarcocyst in the intermediate host?
Toxin (sarcocystin)
44
What are the two main types of sarcocystosis?
Intestinal and Muscle
45
Which type of sarcocystosis is associated with the sarcocyst stage?
Muscle sarcocystosis
46
The definitive host becomes infected by ingesting?
Bradyzoites
47
The intermediate host becomes infected by ingesting?
Sporocysts
48
The toxin secreted by the sarcocyst is called?
Sarcocystin
49
Sarcocystis sp. has a/an: a) Direct life cycle b) Indirect life cycle c) Autogenous life cycle
Indirect life cycle
50
Besnoitia besnoiti commonly affect calves younger than?
6 months of age
51
Drug used for Toxoplasma treatment but should be discontinued after 30 days of no response because it causes megaloblastic anemia or leukopenia
Pyrimethamine
52
What is the definitive host for the enteroepithelial cycle of Toxoplasma?
Cats
53
In the enteroepithelial cycle, Toxoplasma multiplies in the cat's?
Intestines
54
Related to Toxoplasma, what is the product of the sexual reproduction phase in the cat?
Oocysts
55
Related to Toxoplasma, which asexual reproduction process involves internal budding with two daughter cells?
Endodyogeny
56
Related to Toxoplasma, in the extra-intestinal cycle, both final and intermediate hosts become infected by ingesting?
Sporozoites liberated from oocysts
57
Related to Toxoplasma, after ingestion of oocysts, sporozoites transform into which rapidly multiplying stage?
Tachyzoites
58
The acute phase of extra-intestinal Toxoplasma infection is characterized by asexual multiplication of?
Tachyzoites
59
59
The chronic phase of Toxoplasma infection is characterized by the presence o?
Cysts containing bradyzoites
60
How long does it take for cats to shed Toxoplasma oocysts after eating bradyzoites?
3-10 days
61
During the acute stage of pathogenesis, Toxoplasma parasites primarily multiply in?
The tissues
62
The chronic stage of toxoplasmosis is usually?
Asymptomatic
63
In subacute toxoplasmosis, immunity develops more slowly in which tissues compared to extraneural tissues?
Brain and retina
64
Related to toxoplasmosis, cyst rupture in the chronic stage can occasionally occur in which organs?
Brain, eye, and myocardium
65
In cattle, how long is the duration of chronic stage of toxoplasmosis?
Short-lived (2-6 months)

3rd Year Protozoology (12 decks)

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