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Why is an understanding of a parasite's lifecycle essential in limiting the spread of the parasite? An example would be much appreciated as well!

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Because specific stages of the life cycle can be targeted and progression is prevented. Only one part of the cycle needs to be interfered in for the replication process to be halted.

For example, the plasmodium parasite is transferred from mosquitos to humans and vice versa. When in humans it enters the bloodstream eventually, penetrating red blood cells and "hiding" inside them. If you stop their ability to enter the red blood cells then you effectively kill them because they will be circulated to the spleen where they will be filtered out of the blood. So that's one area that researchers could look at, for example. I hope the above info is accurate, it's been a while since I studied malaria.

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