Coccidia

Topics: Apicomplexa, Coccidia, Toxoplasma gondii Pages: 8 (897 words) Published: June 23, 2013
Coccidia
Coccidia

Subkingdom
Protozoa
Subphylum
Sarcomastigophora
Phylum
Ciliophora
Phlyum
Apicomplexa
Subphylum
Sarcodina
Subphylum
Mastigophora
Class
Lobosea (Amebas)
Class
Zoomastigophora (Hemoflagellates/ flagellates
Class
Kinetofragminophorea
(Ciliates)
Class
Sporozoa
subclass
Coccidia
Subkingdom
Protozoa
Subphylum
Sarcomastigophora
Phylum
Ciliophora
Phlyum
Apicomplexa
Subphylum
Sarcodina
Subphylum
Mastigophora
Class
Lobosea (Amebas)
Class
Zoomastigophora (Hemoflagellates/ flagellates
Class
Kinetofragminophorea
(Ciliates)
Class
Sporozoa
subclass
Coccidia

Taxonomic Classification of Protozoans
Taxonomic Classification of Protozoans

Coccidia
* are a subclass of microscopic, spore-forming, single-celled obligate intracellular parasites belonging to the Apicomplexan class Sporozoa General Characteristics
* Members of the class Sporozoea in the phylum Apicomplexa * Life cycle is characterized by an alternation of generations- one asexual and one sexual – occurring in the same host or in another host * Asexual reproduction – Schizogony

* Sexual Reproduction - Sporogony
The species of medical importance is found in subclass Coccidia and cause disease of human includes one of the following genera: * Genus Isospora
* Genus Cryptosporidium
* Genus Toxoplasma
* Genus Plasmodium
* Genus Sarcocystis

*Isospora belli
* Morphology
* Size Range: 20-33 µm long and 10-19 µm wide
* Appearance: Transparent
* Shape: oval
* Cell wall: 2 layered, colorless and smooth
* Developing sporoblast: unicellular w/ granular cytoplasm * Young oocyst: 2 sporoblast
* Mature oocyst: 2 sporocysts, each containing 4 sausage-shaped sporozoites

Isospora belli Immature Oocyst Containing One Sporoblast From CDC

Isospora belli Immature Oocyst Containing One Sporoblast From CDC

Mature Oocyst
Mature Oocyst

* Life Cycle

* Pathology & Clinical features
* Asymptomatic (infection is self-limited)
* Isosporiasis
* Mild gastrointetinal discomfort
* Severe dysentery
* Weight loss
* Chronic Diarrhea
* Abdominal pain
* Anorexia
* Weakness
* Malaise

* Laboratory Diagnosis
* Microscopic demonstration of the large typically shaped oocysts is the basis for diagnosis. Because the oocysts may be passed in small amounts and intermittently, repeated stool examinations and concentration procedures are recommended. * If stool examinations are negative, examination of duodenal specimens by biopsy or string test (Enterotest) may be needed.

* Treatment & Prevention
* For asymptomatic or mild infections
* Bland diet
* Plenty of rest
* Severe infections
* Chemotherapy

* Prevention
* Proper personal hygiene
* Adequate sanitation practices
* avoidance of unprotected sex (homosexual men)

*Sarcocystis Species
* Morphology
* Oval, transparent organism consisting of two mature sporocysts * Each sporocyst is equipped with four sausage-shaped sporozoites * Sarcocystis sp. sporocyst- 100X objective. A, thin cyst wall. B, sporozoite (each sporocyst will contain 4 sporozoites). C, residual body

Sarcocystis sp. sporocyst- 100X objective. A, thin cyst wall. B, sporozoite (each sporocyst will contain 4 sporozoites). C, residual body

A double-layered clear and colorless cell wall surrounds the sporocysts

Sarcocystis sp. sporocyst-100X objective., showing 4 sporozoites within the sporocyst Sarcocystis sp. sporocyst-100X objective., showing 4 sporozoites within the sporocyst

* Life cycle

* Pathology & Clinical features
* Fever
* Severe diarrhea
* Weight loss
* Abdominal pain

* Laboratory Diagnosis
* Microscopic demonstration of oocysts is the basis for diagnosis. * Sporocyst may be seen singly or in pairs that appear to be cemented together

*...
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