SK320 U8, Parasitic invertebrates
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- (Plural cercariae)
- The larval form of the parasite, developed within the germinal cells of the sporocyst or redia.
- A cercariae has a tapering head with large penetration glands; motile carceriae find and settle in the intermediate host, where it becomes either an adult or a metacercaria (species dependent)
- A condition where the host appears to resist further parasitic infections, even though the adult form survives in their blood.
- New invading parasites will initiate the immune response.
Larval stage of the tape worm, consisting of a single invaginated scolex enclosed in a fluid filled cyst.
The host inside which the parasite reaches reproductive maturity.
- Injection of "naked" (cell free) DNA encoding pathogenspecific antigens, into the vaccine recipient.
- DNA is incorporated into muscle DNA, where enough pathogenspecific antigens are synthesised to induce a protective immune response.
- Type of worm, some species of which are parasitic.
- Includes Platyhelminthes (flatworms, flukes and tapeworms) and Nematodas (roundworms)
- Fluid-filled sac within a host tissue, formed by the oncosphere of a tapeworm Echinococcus.
- The sac enlarges gradually, producing protoscolices (juveline tapeworm larvae) which are eventually released from the cyst.
Indirect life cycle
A parasitic life cycle where an intermediate host of vector is involved; always the case for flukes and tapeworms.
- One or more organisms parasitised by juvenile stages of a parasite with a complex life cycle. Harbours a series of larval changes.
- E.G shrimp and fish (first and second intermediate hosts) for Anisakis simplex, a nematoda causing abdo pain.
- (Singular metacercariae)
- Cercaria larvae encysted and resting, prior to the parasites being transferred to the definitive host.
One of the five morphological stages of a fluke. Free -living motile form with celia, which penetrates or is ingested by the intermediate host (mollusc) to become a sporocyte.
Egg sac containing six-hooked (hexacanth) larva of tapeworm.
- (plural Rediae)
- A fluke larval form with an oral sucker, it will produce wither more rediae or cercariae.
- An important human parasitic disease caused by infection by blood flukes of a number of species of Schistosoma.
- The disease was originally known as bilharzia.
An elongated sac that produces a form of parasitic fluke larva (rediae) or, in some cases, more sporocysts.
- An agent such as a bacterial plasmid or disabled virus that is used to carry DNA into cells.
- The same term is used for an organism that carries a parasite or pathogen from one host to another.
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