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Parasitology > Sarcocystis > Flashcards

Sarcocystis Flashcards

1
Q

Can Sarcocystis transmit from animal to man?

A
  • Yes, and vice versa - zoonosis
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2
Q

what are the heteroxenous coccidia species of apicomplexa?

A
  • toxoplasma
  • sarcocystis
  • neospora
  • Cystoisospora
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3
Q

What is a special characteristic of Sarcocystis?

A
  • heteroxenous cyst-creating coccidia with indirect life cycle
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4
Q

what is the DH of Sarcocystis?

A
  • Carnivores
  • Man
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5
Q

What is the IH of Sarcocystis?

A
  • Hebivores
  • Omivores
  • Birds
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6
Q

What is the LC of Sarcocystis in IH?

A
  • excystation in SI → merogony → sporozoite
  • → endothelia of blood capillaries → meront → Lc
  • → 3.gen. of meronts → muscles → cyst → bradyzoit
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7
Q

What are the Life cycle stages of Sarcocystis in DH?

A
  • gamogony
  • sporogony in SI
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8
Q

name a Sarcocystic spp.

A
  • Sarcocystis neurona
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9
Q

How many Sarcocystis spp are IH muscle cyst?

A
  • approx. 90 species
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10
Q

diagnosis of Sarcocytis in DH:

A
  • sporulated cyst in feces, flotation method
  • 2 sporocyst (4 sporozoites each), 8 sporozoites
  • 14-15 x 9-10 μm
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11
Q

Dianosis of Sarcocystis in intermediate host:

A

iv. – serol. test (IFAT, ELISA, IHAT)

  • biopsy → histology

p. m.

  • digestive method (microcyst < 1 mm)
  • histology
  • meat inspection (macrocyst 4-15 mm)
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12
Q

What is the IH of Sarcocystis neurona?

A
  • raccoon
  • armadillo
  • skunk
  • fel. and other.
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13
Q

What is the DH of Sarcocystis neurona?

A
  • possum (Didelphis virginiana, D. albiventris)
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14
Q

What is the causal host of Sarcocystis neurona?

A
  • equine
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15
Q

Sarcocystis spp.:

A
  • S. ovicanis (ov, ca)
  • S. capracanis (cap, ca)
  • S. equicanis (eq, dog)
  • S. hircicanis (dog)
  • S. suicanis (su, ca)
  • S. suihominis (su, man)
  • S. porcifelis (su, fe)
  • S. cruzi (bo, ca)
  • S. hirsuta (bo, man)
  • S. arieticanis, gigantaea, medusiformis (ov)
  • S. fayeri (eq)
  • S. horvathi
  • S. cuniculi (rabbit)
  • S. rileyi

the host may not be correct

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16
Q

Life cycle stages of Sarcocystis is:

A
  • Schizogony:
  • Gamogony:
  • Sporogony:
17
Q

Explain Schizogony of Sarcocystis in IH:

A
  • Endothelial cells – 2x
  • rapid multiplication = endopolygony
  • Leukocytes – slow multiplication = endodyogony
  • Muscles – slow multiplication = endodyogony
  • Young cysts – metrocytes
  • Mature cysts – bradyzoites
18
Q

where does Gamogony of Sarcocystis in IH occur?:

A
  • Lamina propria of SI
19
Q

where does sporogony of Sarcocystis in IH occur? is it endogenous or exogenous?:

A
  • Endogenous
  • small intestine
20
Q

Sarcocystis neurona cause what in horses?

A
  • protozoan myeloencephalitis of horses
  • (equine protozoal myeloencephalitis - EPM)
21
Q

Describe granular nudular stage (GNS)

A
  • caseous and necrotic material
  • parasites and their parts (scolex, bradyzoites) not detectable
  • parasites killed by host immune system = non-infectious stage, only organoleptic depreciation of meat
22
Q

Macroscopic detection of muscles with Sarcocystis

A

cysts visible with naked eye
- Sarcocystis gigantea = S. ovifelis
- S. rileyi
- S. cruzi = S. bovicanis

23
Q

Macroscopic detection of Sarcocystis rileyi

A
  • mallard duck
  • chest muscles
24
Q

Macroscopic detection of Sarcocystis gigantea AKA Sarcocystis ovifelis

A
  • sheep
  • oesophagus
  • cyst size: 10mm
25
Q

How to treat/diagnose Sarcocystis (in IH)?

A

Histology

Direct microscopy is NOT efficient

  • Sarcocystosis of cattle: Sarcocystis bovicanis/cruzi – cysts < 1 mm
  • not detectable during the meat inspection in slaughterhouse!
26
Q

histology of Sarcocytis

A
  • Reference method – efficient
  • Not suitable due to the long-time of sample processing = carcass suspended in slaughterhouse
  • Alternative way = cryosection technique (1 day procedure)
27
Q

Picture of Sarcocytis

A
  • oval shape
  • light grey
  • 14-15 x 9-10mm
28
Q

Picture of Sarcocytis + other picture

A
29
Q

Macroscopic detection of Sarcocystis Cruzi aka S. bovicanis

A
30
Q

Sarcocystis cruzi is also known as

A

sarcocystis bovicanis

31
Q

Sarcocystis hirsuta aka

A
  • S. bovihominis
32
Q

Sarcocystis ovicanis aka…

A

S. tenella

33
Q

Sarcocystis gigantaea aka …

A

S. ovifelis

34
Q

Sarcocystis capracanis aka…

A

S. moulei

35
Q

Sarcocystis suihominis aka..

A

S. miescheriana

36
Q

Sarcocystis equicanis aka

A

S. bertrami

Parasitology (23 decks)

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