Coccidians Flashcards
Class Sporozoea
Coccidia
Infect the intestinal tracts of animals.
Coccidian parasites
obligate, intracellular parasites, which means that they must live and reproduce within an animal cell.
Coccidian
with no definite organ of locomotion.
Coccidia
It may have body flexion, gliding or undulating of longitudinal ridges.
Coccidia
Characterized by thick-walled oocysts excreted in feces.
Coccidians
[5] Coccidian in Humans
- Cryptosporidium
- Isospora
- Cyclospora
- Toxoplasma
- Sarcocystis
[3] Only a single direct cycle of transmission occurs, both the asexual and sexual stages of multiplication occurs in a single host and that is to man.
Cryptosporidium
Isospora
Cyclospora
[2] The sexual stages are usually in the intestinal mucosa of a carnivorous host (the predator). The result in an oocyst or sporocyst that passes out in the feces to infect an intermediate host (the prey) in which asexual multiplication of the parasite occur.
Toxoplasma
Sarcocystis
[3] Life cycle of Coccidians
- Merogony
- Gametogony
- Sporogony
schizogony
[life cycle of coccidians]
Merogony
produce merozoites.
[life cycle of coccidians]
Merogony
gamogony or gametocytogenesis.
[life cycle of coccidians]
Gametogony
produce micro- and macrogametes.
[life cycle of coccidians]
Gametogony
produce sporozoites.
[life cycle of coccidians]
Sporogony
completed on host cell.
[life cycle of coccidians]
Sporogony
thin (autoinfection) or thick walled oocysts.
[life cycle of coccidians]
Sporogony
cosmopolitan distribution.
Toxoplasma Gondii
seropositive prevalence rates vary — generally 20-75%
Toxoplasma Gondii
Generally causes very benign disease in immunocompetent adults.
Toxoplasma Gondii