Virus within a virus: possible?

Is it possible that there might be a virus (of the giant, ancient, frozen-in-glaciers type) that is, for lack of a better explanation, double-layered? As in the first layer affects the host and then later, after the host is weakened, the second, inside virus attacks to kill. Is this scientifically plausible?

To clarify, I'm not asking if something like this currently exists. I'm asking if it's possible. If it's something from eons ago that remains frozen in melting glaciers, it may exist yet unknown.

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Virus within a virus: possible?

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