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Schistosomiasis

by Vincent Racaniello, PhD
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    00:01 Alright let's move from the roundworms into the flatworms, Schistosomiasis. These are helminths again; of course they are worms, non-segmented flatworms, also known as trematodes.

    00:16 Here in this photograph is Schistosoma mansoni. There is actually an adult male and a female in this picture. Can you see them? Probably not, you might see the head of the female just sticking out, she is located in a groove along the length of the male worm. They are mating. This is how they mate. This is how they mate inside of you and the female will then shed eggs which go on to spread to others. So the two worms find each other, they come together, the female fits into this groove, they mate and they produce eggs, that's Schistosoma mansoni. Here is another just schistosome, Schistosoma hematobium, these are the cyst forms in a tissue. This is Schistosoma japonicum. This is the cercarial form. We will talk about what this is in a moment. And another cyst form of Schistosoma mekongi. So all of these different species of schistosomes can cause the same type of schistosomiasis. Now remember again, these are worms, trematodes in particular, non-segmented flatworms. These different schistosome species are located in different parts of the world, depending on a snail. The intermediate host for schistosomiasis, schistosomes is the snail of different kinds and in this snail, it goes through a certain morphological transformation, it doesn't complete the whole lifecycle, that's why it's an intermediate host. Globally there are somewhere between 200 and 300 million infections.


    About the Lecture

    The lecture Schistosomiasis by Vincent Racaniello, PhD is from the course Parasites.


    Included Quiz Questions

    1. Trematodes
    2. Tissue nematodes
    3. Intestinal nematodes
    4. Cestodes
    5. Cyclospora
    1. Snails
    2. Monkeys
    3. Cows
    4. Mosquitos
    5. Birds

    Author of lecture Schistosomiasis

     Vincent Racaniello, PhD

    Vincent Racaniello, PhD


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