Signs For Diseasing Diseases
Parasitical Worms.com Roundworm belongs to Ascarididae, whose scientific name is Ascaris lumbricoides. It is one of the most common types of intestinal parasitic worms in humans, about 1,400 million infected in the world (23% of the world's population), with about 60,000 - 100,000 deaths each year.
1. DISCRETION OF THE DISKNEY
Ascarid roundworm is the largest parasitic worm in the human intestine, the tubular body is long like a chopstick, ivory-white or light pink, covered by a thick crust, with two pointed, pointed conical tips
The female is 20-40 cm long x 3-6mm, the female's tail is straight. The genital opening is located on the ventral surface of the front one third
Males are 15-30 cm x 2-4mm smaller than the females, the tail is curved toward the abdomen and have nearly the same two intercourse spines at the end of the tail (size 2.0 - 3.
Fertilized or solid eggs (fertilized eggs)
Fertilized eggs are oval or sometimes slightly round, proportioned, size 45-70 µm x 35-50 µm.
The thick case consists of three layers:
+ The outer layer is a rough, rough, animal-like albumin layer, dyed yellow brown due to the absorption of bile salts.
+ The middle layer is smooth, thick and transparent, concentric layered, made up of glycogen.
+ The innermost layer is the yolk membrane created by lipids
Inside the egg contains solid embryos, compact into a block, undivided when new eggs are born
Ascaris eggs have the form of an embryo that is excreted in faeces and is not yet infectious; however in the stool sample over 12 hours, eggs can be found with two or four embryos.
Unfertilized eggs or unfertilized eggs
Broken eggs are found in the stool at about 15%, as the female roundworm does not fertilize the male roundworm but still lays eggs.
Non-fertilized roundworm eggs are oval in shape, longer and narrower than the fertilized eggs, size 85-95 xm x 35-45 µm. Without a lipid yolk membrane, the shell has only two layers: the albumin layer and the thinner glycogen layer in the fertilized egg.
. There are no embryos inside the egg, filled with irregularly sized round particles. Unfertilized eggs do not grow and will degenerate.
Being fertilized or unfertilized eggs peeling off the rough outer layer of albumin, making the outer seminal shell or unfertilized peeling off the rough outer layer of albumin, making the eggshell become smooth, easily confused with the eggs of a few other helminths.
2 DISCOVERAGE DEVELOPMENT PROCESS
Adult and male worms parasitize in the small intestine of humans, usually in the small intestine, absorbing chyme in the small intestine. The nutrition of worms requires protid, glucide and vitamins A, C.
The female worms lay eggs, the eggs are excreted in feces and only the fertilized eggs continue to grow in the outdoors.
Ascaris eggs for good resistance to the outside environment. In porous, moist, shaded soil, an infectious egg can survive for up to 7 years. Chemicals at concentrations commonly used * chlorine 2%, formrmalin 2%, 50% solution of hydrochloric, nitric, acetic, and sulfuric acid .
..) do not kill roundworm eggs.
At a temperature of 20-300C in moist, shaded or in water, fertilized eggs require at least 10-15 days to develop into eggs containing infective larvae.
People infected with roundworm through the gastrointestinal tract, due to ingestion of eggs containing larvae of infectious stages in vegetables, fruits, drinking water, food with flies, cockroaches perching and dirty hands.
When a person swallows eggs containing larvae, under the effect of larvae digestive juices escape the eggshell in the duodenum. Eggshell decomposes when the temperature is 370C, moist, high CO2 concentration, low redox and pH about 7.0.
The larvae are 0.2-0.
3mm x 0.014mm in size and have a rabditiform oesophagus that extends up to ¼ of the body length through the wall of the small intestine, according to mesenteric veins and venous system door to liver, out of the liver vein in the liver to the right heart and to the lungs.
The larvae molt twice in the lungs (on 5-6 and 10 days), µ, 5-2mm long and 0.02mm body diameter. While the pulmonary capillary diameter is only 0.01mm, the worm larvae break the pulmonary capillaries to escape into the alveoli.
From the alveoli, the larvae go back up into the small bronchi, trachea, then fall into the esophagus, stomach, and when the small intestine finally molts to become adult worms.
From the time the larvae are swallowed until the adult worms lay eggs, the eggs appear in the feces, the cycle takes about 2-25 months.
The life span of adult worms is about 12-18 months.
. Evidence is that those who move into non-endemic areas of the egg roundworm larvae stop being discharged within less than 18 months. Eggs can continue to be released in the stool for up to 7 days after the adult is ejected.
3. EPIDEMIOLOGICAL CHARACTERISTICS OF DISEASES
Ascaris (Ascariasis, Ascariosis) is found all over the world, but is common in tropical countries, infection rate is very high: 25% in Brazil (Rio de Janeiro), 47% in Egypt (Alexandria), 35% in India (Hyderabad), 64% in Malaysia (Kuala Lumpur), 55% in Mexico (Coatzacoalcos), 68% in Nigeria (Lago. . Dịch vụ: Thiết kế website, quảng cáo google, đăng ký website bộ công thương uy tín
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