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Plasmodia must go through their sexual cycle, which lasts some 10-15 days.
There is no transovarian* transmission of malaria, and therefore the new
adult mosquitoes are free of this disease.
*Transovarian transmission of the agents of some rickettsial diseases
does occur in their arachnid vectors (ticks and chiggers): infected
adults infect their eggs >> new larvae and the adults (both hematophagous) are infectious!
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