Waterborne diseases and prevention – Schistosoma Spp



The last type of diseases we are going to treat is Schistosoma and this Schistosoma is worldwide. The Schistosoma species, they cause schistosomiasis. Schistosomiasis can be caused
by Schistosoma mansoni. Mansoni is the one that causes
urinary schistosomiasis and S. haematobium is the one that causes
the other kind of schistosomiasis. Then the overall burden of the disease is that
more than 200 million people, mostly poor people in South Africa,
in Sub-Saharan African countries, they acquire this disease. But what is important about this disease is that,
when people travel to infected areas, travellers, they go swimming in contaminated water,
they come here with the risk of schistosomiasis. Research that was done in France in 2006 showed
that 16 people were infected with this parasite, and again another research
was carried out in the Netherlands, and it shows that a lot of people were infected
as well with this parasite. How? Here is the life cycle of the parasite. If an infected person goes into the water, because that is why we call them waterborne diseases,
and urinates or defecates in the water, because the infected person is having
the male and female parasite in them, when they urinate, this parasite then comes into the water,
swims and gives birth to a miracidium. Miracidium is the larva
and this miracidium enters into snails. It is inside, the snail is the intermediate host. It is in this intermediate host,
that this larva now becomes sick area, infected. This is an infected one.
And then the snails now deposit it in the water. If someone takes a snail out of water
or eats this snail, it's infected. So with this larva, sick area in the snail,
it is released into the water. When another person comes in, to swim
or to do other things, to wash in the water, it carries this sick area that now develops into the system of the person and you become sick.

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