Table of contents:
- General characteristics and structure of the parasite
- Life cycle of a lanceolate fluke
- Ways of infection and consequences
Video: Lanceolate Fluke Fluke: Eggs And Development Cycle
- 1 General characteristics and structure of the parasite
- 2 Life cycle of a lanceolate fluke
- 3 Ways of infection and consequences
Quite often, parasitic organisms can appear in the human body that can significantly worsen health and cause discomfort. Scientists have identified more than 700 species of flatworms, for example, the lanceolate fluke is one of the common types. This parasitic organism attacks important organs and, in some cases, is fatal. In this article, we will take a look at the life cycle of the lanceolate fluke.
General characteristics and structure of the parasite
The lanceolate parasite belongs to the Plagiorchiformes order of the Dicrocoeliidae family. In appearance, the lanceolate fluke has a small flat body, the width of which is 2.5 millimeters, and the length can reach up to 1.2 centimeters. The surface of the fluke is predominantly covered with thorns, the mouth of the parasite ends in the pharynx, resembling a tube, with which it absorbs useful elements from the body. The intestine of the parasite has 2 unbranched trunks, which run from the side to the very end of the body and end. As a rule, lanceolate fluke is formed mainly on wild and domestic animals. The color of the parasite larva is brown or yellow. The structure of the female body includes a small rounded ovary, located behind the testes, paired vitellineae, lying on the sides.The lanceolate fluke has a seminal receptacle and a highly developed uterus, which occupies almost the entire back of the body. The structure of the male body includes two round testicles, which are located behind the abdominal suction cups.
Scientists have recorded cases when the lanceolate fluke hit hares, rodents, bears. In the human body, the fluke rarely parasitizes, however, if the worm gets inside, then it affects the bile ducts of the liver.
Life cycle of a lanceolate fluke
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What does the lanceolate fluke cycle consist of? The parasite's invasive egg is swallowed by a snail, inside which the larva encapsulates and begins its developmental process, which lasts 3 months. After 3 months, the egg turns into a cercarium, which comes out with the snail mucus and enters the environment. Then the mucus is swallowed by the ant, as a result of which a protective cyst capsule is formed. The cyst affects the nervous system of the insect and completely changes its behavior; the ant remains on the grass at any time of the day. Thus, the chances of human consumption of the infected ant are increased. After entering the human body, the lanceolate fluke, or rather its larva, travels through the digestive tract, bile ducts and enters the liver, where its formation and maturation takes place. The photo shows the entire development cycle of the lanceolate fluke
It is worth noting that one individual of the parasite is capable of producing more than one million eggs in one week. It is important to understand that a full life cycle is impossible without the presence of two removable permanent carriers of the parasite.
Ways of infection and consequences
It is known that the infection of the human body occurs due to the penetration of an infected ant with the help of water or food. It is worth noting that human infection can occur exclusively through the use of a fluke at the metacircaria stage, without one intermediate carrier. When the bile duct is affected, the lanceolate fluke can cause certain symptoms. As a rule, the symptoms of the disease are manifested in the form of:
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- attacks of pain in the hypochondrium;
- allergic cough;
- swelling of the legs and arms;
- increased salivation;
- the presence of pain in the intestines.
Based on medical practice, most often the fluke infects the child's body, this occurs in the process of eating food, which may contain infected ants. Infection is observed on all continents of the earth. With a small ingress of parasites into the body, the pathology proceeds without symptoms, with excessive ingestion of worms, infection occurs, which turns into dyspenia of the biliary tract, hepatitis and cholangitis. In this state, the disease is acute.
A fluke can also enter the body of an adult, for example, when eating wild sorrel, with poor processing of meat products, as well as when ants get on food. Within 7 weeks, the fluke reaches puberty, after which dysfunction occurs in the liver of the bile ducts, and clogged ducts provoke the development of jaundice. To diagnose the parasite in the body, a general analysis of calla is assigned to determine the transit eggs.
The probability of infection of the human body with a lanceolate fluke is quite small, however, a minimal risk should not be excluded. Choose food carefully, observe hygiene. If suspicious symptoms are found, it is recommended to consult with an infectious disease specialist.