malaria clarification

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I was wondering does anyone know what the defined prophylactic treatment is for malaria? Also in life cycle of malaria I read that it's the blood stage parasites that induce the clinical symptoms of the patient- does the blood stage parasites refer to merzoites? or does it also include schizonts and gametocytes?

 

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http://www.cdc.gov/malaria/travelers/drugs.html

Plasmodium species exhibit three life-cycle stages—gametocytes, sporozoites, and merozoites. Gametocytes within a mosquito develop into sporozoites. The sporozoites are transmitted via the saliva of a feeding mosquito to the human bloodstream. From there they enter liver parenchyma cells, where they divide and form merozoites. The merozoites are released into the bloodstream and infect red blood cells. Rapid division of the merozoites results in the destruction of the red blood cells, and the newly multiplied merozoites then infect new red blood cells. Some merozoites may develop into gametocytes, which can be ingested by a feeding mosquito, starting the life cycle over again.