Eggs, Finns, larvae, cysts of bovine tapeworm - photos, sizes, how they look, where they live?
Bovine tapeworm is a banded helminth that causes the disease of teniarinchiasis.This worm enters the human body at the stage of the larva, and the previous stages of its life cycle take place in the skeletal muscles of cattle.However, the cow is only an intermediate host, and the parasite does not bring much harm to it, which you can not say about a man.
Helminths are dangerous to humans at all stages of their life cycle.There are only 3 forms, changing inside the animal's body:
- egg that enters the digestive tract of the cow with herbal food;
- Oncosphere or cyst - the first stage of the larva, which is released from the protective shells already in the food system;
- Finn is the second larval stage, the transition to which is possible only in the muscular tissue of cattle.
Eggs of bovine chain
The first stage of the existence of a bull chain is eggs that stand out in the segments from the human body in which the worms live.Belt helminths are hermaphrodites, so one adult is enough for reproduction
Nature has also taken care of maintaining the normal genotype.If two or more individuals are present in the intestine of the person, cross-fertilization is carried out: the testes of one worm fertilize the ovule of another.If so far only one helminth parasitizes the mucosa of the esophagus, the fertilization of the eggs will occur in different segments of the same parasite.
Bovine tapeworm eggs, photos of which can be made only under the electron microscope, are very small in size.Given that only one joint( which reaches only 6 mm in length) contains up to 180 million eggs, it is impossible to eliminate them in pasture for cattle.Therefore, to prevent infection, you must follow the rules of individual prevention.
The helminth eggs are colorless oval in shape.The shell is smooth, on it there are two processes in the form of short threads, with which the future worm is attached to the plants.The egg consists of a cyst of a bovine tapeworm in the form of an oncosphere, and several transparent membranes.
The shell of the egg that emerges from the body of the final host is quickly destroyed by contact with oxygen.Oncosphere can exist independently in the open air for up to 5 days, and then it dies.
Visually detecting in the beef very small eggs like beads, eliminate them, however, remember that they can not infect you with worms.They can not miss the 2 stages of transformation, so they will simply perish.But for domestic animals, eggs of bovine tapeworm can bring malaise and weakening of the immune response.
Larvae of bovine chain
Oncosphere is called the first larval stage of helminth development.It is released from the protective shells and through the thin walls of the stomach enters the lymph or blood.Further, the larva enters the skeletal musculature( the back, sternum or neck portion), where it spends the next 2-3 months.
Asking the question, what do the larvae of a bull tartan look like in meat, the answer is ambiguous.This stage of the life cycle can actually be found in beef, but it is difficult to consider the peculiarities of the structure with the naked eye.Oncosphere bovine tapeworm, unlike eggs, is not transparent, but yellowish-brown.On its surface there are 3 pairs of processes in the form of hooks, which will then be located on the helminth head( as shown in the photo).
The larva of the first order is not dangerous to humans, just like the eggs of a worm.However, when yellowish ovals up to 0.5 cm in length are found, they should be extracted from the meat.
Finn bovine chain
Finn is very similar to an inverted larva, and this stage is the most dangerous for the human body.Finn looks like a smooth oval of a yellowish shade up to 1 cm long, filled with a turbid liquid.At one end is a cavity in the form of an inverted head of a bull chain.
It's quite easy to recognize the Finn in the skeletal areas of the beef carcass.In addition, it is necessary to be cautious not only with the muscles, but also with the cow's tongue, and also the heart - the Finn can be in any part of the body of cattle, where a good blood flow is carried out, with which it enters the organ.
It is not necessary, if you do not heat the meat thermally, there will be an infection with a bull chain.Finn remains viable only within a year after the transformation from oncosphere.Go to the helminth stage in the body of the intermediate host is impossible, so it is impossible to detect the worms in the meat.
Having noticed in the musculature of an animal flat or annel worms, it is better to throw beef, as it indicates that it has long been no longer the first freshness.But Finns just do not indicate the corruptness of meat, and taking them out, the product can be used.
The second larval stage is always anchored between the muscle fibers, so the meat needs to be properly heat treated.The cycle of life of a bull's chain is depicted in detail in the photo.