Parasitology Quiz 3 Flashcards
Sarcocystis Crypto T. gondii Neosporum canis, hughesi
What is the life cycle of crypto?
direct and autoinfection
What do the cysts look like of crypto?
very small, 4 naked sporozoites (sporulate before leaving host)
What is the best way to diagnose crypto?
acid fast stain, tiny eggs are hard to see without stain
What are other diagnostics for crypto?
immunomagnetic seperation negative staining immunohistochemistry ELISA PCR
How can oocysts of crypto be destroyed?
resistant to most chemical agents, use hydrogen peroxide
What is the treatment for crypto?
clostrum
supportive therapy - parmomycin too expensive to treat
What disease does sarcocystis cause in horses?
equine protozoal myeloencephalitis
What animal is a dead end host in sarcocystis infections?
horses
What are the definitive and intermediate hosts of sarcocystis?
definitive - predator
intermediate - prey
How does the predator become infected with sarcocystis?
eats sarcocysts in muscles of prey
What are the two phases in intermediate hosts?
acute - tachyzoites
chronic - sarcocysts develop that contain bradyzoites
What are the SE of sarco in cattle?
fever, decreased milk yield, abortion in last trimester
What are the side effects of sarco in sheep>
abortion, ataxia, encephalomyelitis
What are the SE in definitive hosts of sarcocystis?
asymptomatic
What animals is sarcocystis an emerging pathogen?
marine mammels
Does sarco infect humans?
yes - lots of symptoms
What is the best test to test for sarcocystis?
Western Blot and IFAT - detect in CSF (for horses)
Is a positive western blot test a diagnosis for sarcocystis neurona?
No, can cross react with other species
What disease is toxoplasma gondii similar to?
sarcocystis
What animals does toxo gondii infect?
many spp of warm blood vertebrates
What are the definitive hosts of toxoplasma?
domestic and wild felids
What are the facultative intermediate hosts of toxoplasma?
wide range of vertebrates/birds
How long is the pre patent period of toxo gondii?
3 to 10 days
When are oocysts shed in toxo gondii?
7 to 20 days
What are the clinical signs of toxo in humans?
asymptomatic
What disease of cats predisposes them to T. gondii?
FIV –> acute toxo, no re-excretion of oocysys
What do the oocysts of te genus Hammondia look like?
resemble toxoplasma and isospora felis
What are the symptoms of cats wth Hammondia infections?
asymptomatic
How is hammondia life cycle different from T. gondii?
oocysts are NOT infectious for the definitive host
What are the symptoms of neospora caninum in dogs?
CNS signs and polyradiculoneuritis in puppies
What are the effects of neospora in bovine?
major cause of abortion
What are the symptoms of neospora in equine?
N. hughesi - dx of EPM
What other way can neospora be transmitted besides eating cysts?
transplancental transmission by tachyzoites
What are the ways neospora is diagnosed?
IH, serology, PCR
What are the treatments for neospora?
dog - antibiotics
Neoguard vaccine for cattle
