Answer:
Step-by-step explanation:
Once both are inside the same cell, the interactions between them can be complex.
For example, many viruses have methods for attenuating both immune responses and other cellular anti-viral systems. One virus’ takedown of these defenses could certainly benefit another virus infecting the same cell
Conversely, if one virus ends up triggering a defense that could impact the second virus.
Some viruses manipulate the cellular machinery of their host, perhaps by altering transcription or translation. That’s a clear opportunity for one virus to interfere with another.
Some viruses reproduce by continuously shedding new viruses from infected cells; others lyse their host cell to release viruses. Obviously these two strategies are in conflict — lysis of a co-infected host will end replication in that cell by the virus that was pumping out a steady stream.
Some viruses very specifically parasitize or prey on other viruses — hepatitis Delta requires hepatitis B infection and drives the hepatitis B virus titer down (alas, the clinical disease is worse for the patient). Virophages are another category of viruses preying on other viruses via co-infected hosts. Defective interfering viruses are partial copies of a virus that require full copies to replicate.