Exam III - Sarcocystis spp. Flashcards
Who are the final host and intermediate hosts for Sarcocystis spp.?
Final = Dog, cat, humans, birds & other carnivores.
IH’s = cattle, herbivores, omnivores & birds
ID of sacocystis spp.
oocysts sporulate in the intestine of the final host thus what is commonly seen in fecal exam?
what can be ID’d in the IH?
sporulated oocyst with 2 sporocytes each containing 4 sporozoites.
Bradyzoite cyst in the muscles of IH’s
Sarcocysitis spp.’s life cycle includes ________ reproduction in the final host & _________ reproduction in the IH.
Gametogony (sexual) in the FH & schizogony (asexual) in the IH.
What is the route of infection for Sarcocystis spp. & what is the infective stage?
ingestion of a mature sarcocyst with bradyzoites in muscle tissue of the IH.
sporocysts are infective immediatly after discharge from the host. IH host becomes infected by eating sporocysts in final hosts feces.
what is the sight of infection for the final and intermediate hosts of Sarcocystis spp.?
IH is in muscle tissue
final host is an oocyst or sporocyst in intestinal tract
what are the clinical signs / pathologies of the hosts infected with Sarcocystis spp.?
final host is asymtomatic (sexual reproduction)
cattle/herbivores as the IH with schizogony in the in the endothelium may result in fatal dz (asexual repro). Clinical signs are often observed with the release of the second wave of merozoites about 4-6wks after infection.
How can prevention of Sarcocystis spp spread be controled if one is to attempt interupting the life cycle?
cook meat fed to the final host well enough to kill the parasite & prevent fecal ingestion by the final host.
Sarcocystis neurona can ifect horses and cause what dz?
EPM equine protozoal myeloencephilitis - the # 1 dx’d neurological dz in horses
who is the definitive host of Sarcocystis neurona and how does the horse become infected as the IH?
Ooposium- fecal oral transmission while grazing
what will you find on a histocytochemical staining of the neural tissu in the horse
roest in the brain tissue rather than a cyst
what are the clinical signs found in the horse with EPM?
ataxia, lameness, other neuro signs, serology can be used for the liveng horse dx
- ewesteren blot is a good test to help dx confermation
how can you prevent horses from getting Sarcocystis neurona?
control ooposium population in the area
