Pathogen Question

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As I know, both protozoa and viruses use host cells. But I want to clear up a couple of doubts about the two.

1. Do protozoa take over the host cells? I know protozoa live in the cells, but I think that only viruses take over the host cells. Is this right?

2. Which of the two injects their DNA and RNA into the host cell? I think that only viruses do this.

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