Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
|
What Phylum are coccidia grouped into?
|
Phylum Apicomplexa
|
|
|
Significance of Phylum name
|
Have an apical complex that is involved in cell penetration since they are all intracellular parasites
|
|
|
Fecal oral transmission by oocysts
IMPORTANT in poultry, cattle and swine production industries Diarrhea, weight loss, and deaths can occur |
Eimeria and Isospora (1 host life cycle)
|
|
|
What are the extra-intestinal coccidia with a two host life cycle?
|
Toxoplasma gondii and Sarcocystis spp use intermediate host
|
|
|
Which is highly host specific?
|
Eimeria and Isospora
|
|
|
They multiply by schizogony. How does that work?
|
Uninucleated stage-->multinucleated schizont-->cytoplasmic division occurs-->individual parasites (merozoites)
|
|
|
Environmentally resistant cyst stage
Coccidia are identified based on structure of their sporulated _______ |
Oocyst
|
|
|
Sporulated oocysts--have 4 sporocysts that each contain 2 sporozoites (8 sporozoites total per oocyst)
|
Eimeria
|
|
|
Sporulated oocysts--2 sportocysts each with 4 sporozoites (8 sporozoites total per oocyst)
|
Isospora
|
|
|
Liberation of the sporozoites from the sporocysts then from the oocyst
|
Excystation
|
|
|
# of days it takes for oocysts to appear in the feces after the hosts ingests sporulated oocysts
|
Prepatent period
|
|
|
# of days that oocysts are excreted in the feces of the host
|
Patent period
|
|
|
Pathogenicity depends on...
|
Species of coccidia present
Numbers of oocysts ingested Age of the host Environmental conditions |
|
|
Pathogenicity causes...
|
Rupture of infected cells and release of merozoites=tissue destruction
Villous atrophy=malabsorption Hemorrhage=blood loss Diarrhea |
|
|
What points need to be considered when diagnosing coccidia infections?
|
Clinical signs consistent with coccidiosis
Demonstrate oocysts of a pathogenic species Demonstrate stages in intestines of dead animals Rule out other causes of diarrhea |
|
|
Most anticoccidials are developed for what animal?
|
Chickens
|
|
|
What are the signs seen in cattle coccidiosis?
|
Bloody diarrhea
Weight loss Pneumonia Death |
|
|
What species of coccidia do pigs get?
|
Isospora suis
|
|
|
Is there any good treatment for pigs?
|
No value in treatment of sows and no effective treatment for piglets
|
|
|
What can be done for coccidiosis in pigs?
|
Improved sanitation (wash crates and steam clean)
|
|
|
What genera cause dog and cat coccidiosis?
|
Toxoplasma, Neospora, Sarcocystis, Cryptosporidium, Isospora
|
|
|
May be elongate
May have a cap or other markings May have a thick or rough wall |
Spurious oocysts of dogs
|
|
|
Is coccidiosis zoonotic?
|
No humans have their own Isospora species and get it from food
|
|
|
Characteristics of dog and cat coccidiosis
|
Young animals and extra-intestinal stages
|
|
|
Rabbit coccidiosis affects what organ?
|
Liver
|
