Qualification > Sciences
Human BiOlogy.
Deadly_king:
--- Quote from: iluvme on October 22, 2010, 04:36:42 pm ---Thanks muallima, master key and deadly king :)
How about the house fly?
Explain why one contact with an infected mosquito can lead to malaria but repeated larval contacts are needed to produce symptoms of schistosomiasis.
--- End quote ---
I think i got it now.
Schistosomiasis is caused by larval forms of the parasite which penetrates the body. However our body and defensive system is highly beneficial against these parasites. Our skin for example is almost impenetrable except if we have been cut or some kind of injuries. Only then will the larva be successful to attack us. which is not very likely ;)
Therefore malaria is more dangerous to humans than schistosomiasis since the latter is transmitted more easily and the body's defence mechanism cannot prevent it from entering the body. Our immune system will only respond to it when the parasite is already in the body.
For schistosomiasis, however, they have very little chance of even entering the body. So we are more protected from schistosomiasis than from malaria :D
Ref : http://www.who.int/topics/schistosomiasis/en/
Deadly_king:
--- Quote from: Ari Ben Canaan on October 23, 2010, 06:57:34 am ---Since when do common house flys suck blood from a person ? They dont have the hypodermic needle like thing that mosquitoes have....
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Oops..........i have been mistaken......My bad :-\
You have a point there :)
Indeed houseflies do not suck blood. Sorry for the confusion :-[
House flies can become a vector of certain diseases since they are always attracted to sites of bacteria such as feaces or vomit.
Hence the bacteria may get attached to its hairs or other parts of the body. When the fly lands up on a person, the bacteria has a chance to penetrate the latter's body through the nose, ears, mouth and other parts.
One likely disease transmitted in this way is cholera.
iluvme:
--- Quote from: Deadly_king on October 23, 2010, 06:59:53 am ---I think i got it now.
Schistosomiasis is caused by larval forms of the parasite which penetrates the body. However our body and defensive system is highly beneficial against these parasites. Our skin for example is almost impenetrable except if we have been cut or some kind of injuries. Only then will the larva be successful to attack us. which is not very likely ;)
Therefore malaria is more dangerous to humans than schistosomiasis since the latter is transmitted more easily and the body's defence mechanism cannot prevent it from entering the body. Our immune system will only respond to it when the parasite is already in the body.
For schistosomiasis, however, they have very little chance of even entering the body. So we are more protected from schistosomiasis than from malaria :D
Ref : http://www.who.int/topics/schistosomiasis/en/
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I'm confused.
Deadly_king:
--- Quote from: iluvme on October 23, 2010, 05:15:05 pm ---I'm confused.
--- End quote ---
Would you mind telling me what's confusing you ???
I'll try my best to clear your doubt ;)
iluvme:
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.
--- Quote from: Deadly_king on October 23, 2010, 06:59:53 am --- Our skin for example is almost impenetrable except if we have been cut or some kind of injuries. Only then will the larva be successful to attack us. which is not very likely ;)
--- End quote ---
Where does the skin come into this? Did you mean like when the skin is cut and when water enters?
--- Quote from: Deadly_king on October 23, 2010, 06:59:53 am ---I think i got it now.
For schistosomiasis, however, they have very little chance of even entering the body. So we are more protected from schistosomiasis than from malaria :D
--- End quote ---
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?
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