(M) Coccidia (lecture-based) part 2 Flashcards
Sarcocystis spp., C. cayetanensis, B. hominis
First reported in 1843 by Miescher as white threadlike cysts (Miescher’s tubules) in striated muscles of a house mouse
Sarcocystis
- While a majority infect mammals, about a dozen infect snakes
- This species was debated whether it is a protozoa or fungus. The debate was resolved in 1967 when bradyzoites in the sarcocysts were studied under the electron microscope and were seen to possess organelles found in other apicomplexan parasites such as Toxoplasma and Eimeria
- There are 130 recognized species under this
Sarcocystis spp.
Sarcocystis spp.
Who was the first to report this?
Meischer (1843)
Sarcocystis spp.
Was renamed in 1899 to?
Sarcocystis meischeriana
Sarcocystis spp.
How many species were recognized under this
130
Sarcocystis spp.
Humans serve as definitive hosts for the first 2 species (hominis and suihominis) but can occasionally act also as intermediate hosts for the 3 species (+ lindemanni)
TOF
T
Sarcocystis spp.
This stage shows a banana shaped; the anterior end is rounded
Mature trophozoites
Sarcocystis spp.
- 15-19 um by 8-10 um
- Contain 4 sporozoites and a discrete refractile residual body
Sporocyst
Sarcocystis spp.
Mode of Transmission for S. hominis
ingestion of raw beef
Sarcocystis spp.
MOT of suihominis
Ingestion of raw pork
Sarcocystis spp.
How many days does it take for sporocysts of S. hominis to be excreted after ingestion?
14-18 days
Sarcocystis spp.
How many days does it take for sporocysts of S. suihominis to be excreted after ingestion?
11-13 days
Sarcocystis spp.
pls read thru the life cycle nalang thx mwah
mwahmwah
Sarcocystis spp.
Infective and diagnostic stage (2)
- Sporocyst and thin-walled oocyst passed in the feces
- Cysts w/ bradyzoites ingested in undercooked meat
nasa picture
Sarcocystis spp.
Mono/heteroxenous
hetero
Sarcocystis spp.
Definitive host
dog or human
Sarcocystis spp.
susceptible intermediate host
cow or pig
Sarcocystis spp.
infective stages (3)
trophozoites, cysts, and sporulated oocysts
Sarcocystis spp.
Stage: As the infective stages travel down the small intestines, plates forming the sporocyst wall separate and releases 4 sporozoites that migrate through the gut epithelium to the endothelial cells in small arteries
schizogony or merogony process or ASEXUAL reproduction (ACUTE PROLIFERATIVE PHASE)
Sarcocystis spp.
How long does the acute proliferative phase lasts?
15-16 days after ingestion of sporocysts.
Sarcocystis spp.
Merozoites at this stage form metrocytes and encyst in the muscles forming?
sarcocysts or Miescher’s tubes
Sarcocystis spp.
Identify stage: Merozoites at this stage form metrocytes and encyst in the muscles forming sarcocysts or Miescher’s tubes
CHRONIC CYSTIC PHASE
Sarcocystis spp.
give rise to infectious, crescent-shaped bradyzoites.
metrocytes
Sarcocystis spp.
How long does it tahe for the sarcocyst to mature?
2 1/2 months
Sarcocystis spp.
What enters intestinal cells and change into the male (microgamonts) and female (macrogamonts)forms.
Active bradyzoites
Sarcocystis spp.
Active bradyzoites enter intestinal cells and change into the male (microgamonts) and female (macrogamonts) forms. Fusion results into an?
oocyst