Qualification > Sciences
Human BiOlogy.
Deadly_king:
--- Quote from: iluvme on October 23, 2010, 05:35:28 pm ---This schistosomiasis thing, is spread by the larval forms of a parasite. From what I've read in Google, it is spread through water like cholera.
Where does the skin come into this? Did you mean like when the skin is cut and when water enters?
It is spread by water isn't it? So why is there a very little chance of the larval forms entering the body?
It is very similar to cholera isn't it?
--- End quote ---
--- Quote from: wikipedia ---This disease is most commonly found in Asia, Africa, and South America, especially in areas where the water contains numerous freshwater snails, which may carry the parasite.
--- End quote ---
So it is the snails or larvae which carry the disease. Water is just a medium which is favourable to the carriers.
I took the skin as an example since the latter is involved in the defence mechanism of the human body.
--- Quote from: wikipedia ---Penetration of the human skin occurs after the cercaria have attached to and explored the skin. The parasite secretes enzymes that break down the skin's protein to enable penetration of the cercarial head through the skin. As the cercaria penetrates the skin it transforms into a migrating schistosomulum stage.
--- End quote ---
So it's not really spread by water.
Ref : http://en.wikipedia.org/wiki/File:Schistosomiasis_Life_Cycle.png
If you have any other questions, feel free to ask. I'll not leave you unless you have understood ;)
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