How does silencing of specific mRNA in rna interference prevent parasitic infection

An mRNA can only be translated into proteins if it is single stranded. A double stranded mRNA will function only as a genetic material and not as a source of protein.
In the process of silencing of mRNA, a eukaryotic cell produces a strand of RNA which is complimentary to the mRNA of the parasite, thus making it's RNA double stranded. This inhibits the parasite to translate it's RNA to any kind of protein and thus it prevents infection.
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