Exam 4 - Coccida Flashcards
(17 cards)
What type of coccidia is primarily associated with waterborne outbreaks and foodborne (natural, unpasteruized apple cider)
Cryptosporidium spp.
Where do Cryptosporidium spp. replicate in hosts?
SI epi (inter-cellular)
Oocysts will be passed after 3-5 day incubation period
Clinical signs of symptomatic infection of Cryptosporidium spp.
voluminous watery diarrhea
mucous present, rarely blood/leukocytes
abdominal discomfort, anorexia, nausea, vomiting, weight loss, fatigue, fever
Duration average 12 days (2-26)
Clinical signs of Cryptosporidium spp. in dairy calves
1-3 wks of age
Incubation of ~4 dyas
Anorexia, profuse diarrhea, tenesmus, weight loss
Is Cryptosporidium spp. commonly found in companion animals and people?
Occasionally seen in cats and dogs
zoonotic only in immunocompromised people
What species of intestinal coccidia affect domestic livestock due to ingestion of sporulated oocysts. Replication happens in SI (2-3 cycles). Diarrhea is associated with the destruction of enterocytes by devloping oocysts, Sexual reproduction in fresh, uninfected cells of LI
Eimeria sp.
What is the disease associated with onset of sexual replication of coccidia sp. in host tissues. Mechanical disruption of mucosal cells by gamets (sexual stages)
Coccidiosis
Oocysts are commonly found in fecal samples of healthy animals and herd-wide prevalence can be as high as 50% without disease. Therefore coccidiosis (the disease) is a function of:
age, nutrition, stress, sex, season, gestational status, etc.
Inherent pathogenicity
Herd immunity increases with age and exposure
Two most common species of coccidia in cattle?
Eimeria bovis and Eimeria zuernii
Most common sp. of coccidia in sheep and goats
eimeria ovinoidalis
How do Coccidiostatic drugs treat coccidiosis?
Cause arrested development at specific stages of the life cycle
Parasites remain alive in tissues
Withdrawl of the drug allows the parasite to resume development and completion of lifecycle
How do Coccidiocidal drugs treat coccidiosis?
kill or damage parasite irreversibly
no disease relapse following drug withdrawl
What is the intetinal coccidia that infects Dogs and cats?
PH are mice, birds rodents. Replication happens in SI. Diarrhea associated woth destruction of enterocytes ( 3 asexual cycles). Prepatent period of 6-12 dyas
Cystoisospira (syn. Isospora)
What Cystoisospira is teardrop-shaped and affects dogs
C. canis
What Cystoisospira is round and affects dogs
C. ohioensis
What Cystoisospira is teardrop shaped and affects cats
C. felis
What Cystoisospira is round and effects cats?
C. rivolta
