Morphological observation experiment on the ginger sucker of Brucella abortus

Summary

This experimental method was obtained from the official website of Parasitology, School of Medicine, Shandong University.

Operation method

Morphological observation experiment on the ginger sucker of Brucella abortus

Principle

Fasciolopsis buski, short for gingerbread, is a large parasitic trematode in the human small intestine, which can cause fasciolopsiasis. Ginger worm parasites in the small intestine of humans or pigs, eggs excreted with feces, hatching in the water, trichinae invade the first intermediate host flatworm, through the cystic larvae, female larvae, child larvae and caecal larvae stages, caecal larvae from the snail body to escape, the formation of cystic larvae in the surface of aquatic plant media (such as rhododendron, etc.), the person swallowed cystic larvae due to the raw food rhododendron and infected. The prevalence of ginger worm disease is closely related to pig farming and aquatic plant cultivation. Pigs are the most important host for the parasite. Life history points: adult parasites, intermediate hosts, developmental stages of larvae, infective stages - cysts and how humans become infected with gingerbread worms

Move

I. Self-observation

1. Gingerbread egg slide specimen: Gingerbread is the largest kind of human parasite egg, size about 135×85 micrometers, light yellow, oval, thin shell, a small cap at one end, but not obvious, just discharged from the body, the egg contains an egg cell and 20-40 yolk cells.

spawn of the ginger bug

2. Stained specimen of adult gingerbread: oblong-ellipsoid in shape, 20-75 mm long, 8-20 mm wide. Oral sucker subapical, 0.5 mm in diameter. Abdominal sucker against oral sucker, muscular, funnel-shaped, 5 times larger than oral sucker, visible to the naked eye. Oral sucker attached to pharynx and short esophagus, divided posteriorly into two intestinal branches extending backward in a wavy pattern, forming a blind sac. The two testes are highly branched in a coral shape, arranged anteriorly and posteriorly in the posterior part of the body; the ovary is in front of the testes, lacking the receptacle, the egg-filled uterus is coiled between the ventral sucking egg and the discal nest, and the yolk glands are on both sides of the body; the genital pore is at the anterior edge of the ventral sucking disk.

II. Demonstration

1. Gingerbread in its natural state: note its appearance as a ginger slice, dorso-ventrally flattened and leaf-shaped, its size, color, and the position of the oral and ventral suckers. When alive, it looks like a piece of red meat. Fixed specimens look like ginger slices, the dark-colored area at the edge is where the yolk glands are located, and the abdominal sucker is in the form of a small cave, which is clearly visible.

2. The host of Gingerbread is the host, and the vector is aquatic plants such as water chestnut, water chestnut, wild rice and so on.

3. Gingerbread life history stages: Trichinella, Cercariae, Cercariae mother, Cercariae daughter, Cercariae caudata, Cercariae cysts (infective stage).

flatworm

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