Скачать или смотреть infection and disinfection | life cycle of a tapeworm | phylum platyhelminthes | class 11

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This lecture is about
Infestation
In Taenia (tape worm), the development of the zygote begins while it is still inside the uterus of
female. The last segments or proglottids and their uteri contain completely developed embryo. The
fully mature proglottids break of from the body and pass out of the body of man along with faeces
(undigested waste). The embryo inside the egg is round in shape and has six chitinous hooks.
It shows limited movement of contraction. In order to develop further it must reach a second
host which may be a cow. The parasite remains embedded in the voluntary muscles of cow. If
an improperly cooked beef is eaten by a person, the parasite which has not been killed begins to
develop further in the intestine of man.
Disinfestation
Once the parasite has entered the intestine of man it is diicult to remove it completely. In this
respect care should be taken to cook beef properly before eating it. So that there is no chance of
the parasite entering the digestive system but if it has entered then certain medicines are taken
to remove it. Its complete removal is necessary because if only head remains inside the intestine
it can grow into new tape-worm once again. Besides treatment with drugs, physicians also give
anema to the patient, to fully remove the parasite.