oocyst


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Related to oocyst: cryptosporidium

oocyst

 [o´o-sist]
the encysted or encapsulated ookinete in the wall of a mosquito's stomach; also, the analogous stage in the development of any sporozoon.

o·o·cyst

(ō'ō-sist),
The encysted form of the fertilized macrogamete, or zygote, in coccidian Sporozoea in which sporogonic multiplication occurs; results in the formation of sporozoites, infectious agents for the next stage of the sporozoan life cycle.
[G. ōon, egg, + kystis, bladder]

oocyst

/oo·cyst/ (-sist) the encysted or encapsulated ookinete in the wall of a mosquito's stomach; also, the analogous stage in the development of any sporozoan.

oocyst

(ō′ə-sĭst′)
n.
A thick-walled structure that contains the zygote of an apicomplexan parasite and releases the infective sporozoites.

oocyst

[ō′əsist]
Etymology: Gk, oon + kystis, bag
a stage in the development of sporozoa consisting of a zygote enclosed by cyst wall. Oocysts of malarial parasites are found in the stomachs of infected mosquitoes. Oocysts of toxoplasma organisms are contained in the feces of infected cats. Compare oocyte.

oocyst

Public health The infectious stage of coccidian sporozoites–eg, Cryptosporidium parvum and others, which has a protective wall that facilitates survival in water and other environments

o·o·cyst

(ō'ŏ-sist)
The encysted form of the fertilized macrogamete, or zygote, in coccidian Sporozoea in which sporogonic multiplication occurs; results in the formation of sporozoites, infectious agents for the next stage of the sporozoan life cycle.
[G. ōon, egg, + kystis, bladder]

oocyst

A structure that develops on the outer wall of the mosquito's stomach from the fertilized malarial parasite. The parasite divides repeatedly within the oocyst which rapidly fills up with the infective form of the parasite (SPOROZOITES) until it bursts, releasing the sporozoites into the body cavity of the mosquito to be passed on to humans.

oocyst

the cyst which contains the conjugating gametes in SPOROZOANS.

Oocyst

The egg form of the toxoplasmosis organism.
Mentioned in: Toxoplasmosis

oocyst

the resistant stage of the life cycle of coccidial parasites. It contains a zygote and under appropriate conditions sporulates to become a mature infective oocyst. It may also remain infective for long periods in dry conditions.

oocyst patches
see oocyst plaques.
oocyst plaques
raised patches up to 0.5 inch diameter in small intestinal epithelium in goats and sheep caused by heavy infestation by coccidial oocysts.
References in periodicals archive ?
We propose that vapor nanobubbles can be generated around residual hemozoin in developing oocysts or similar dense forms of heme formed by the malaria parasites at this stage (32,33).
Histopathologic analysis confirmed oocysts in the small intestine and showed intestinal pathologic lesions of hyperplasia and necrosis.
Baycox was also shown to considerably reduce the amount of faecal oocysts excreted back into the lambs' environment, compared to that of a group treated with diclazuril and an untreated group.
oocysts are required to infect a child, for obvious reasons, a study that was conducted with pigs found that a single oocyst was sufi[logical not]cient to cause infection in 13 of 14 experimentally infected pigs," the authors wrote.
Matings there produce offspring protected in toughened structures called oocysts, which the cat excretes into soil and water, and which ready themselves within a few days to start a new generation.
Intrahemocytic oocysts of gregarines of the genus Nematopsis were detected from A.
Eimeria infections in cows in the periparturient phase and their calves: oocyst excretion and levels of specific serum and colostrum antibodies.
A small amount of water was added to the bottom of the cage to keep the feces moist and the oocyst viable.
The oocyst and sporozoite rates (95% CI) of members of An.
The approach considered in this report is to quantify and type oocyst sources in watersheds and compare those with isolates from human patients.
Available in 2004, these filters contain superior microbiological reduction capabilities that have been certified by the State of California Department of Health Services for bacterial reduction, viral reduction and oocyst reduction.