One virus particle prevents multiplication of the second virus. This phenomena is –
**Core Concept**
The phenomenon where one virus particle prevents the multiplication of a second virus is a classic example of interference in virology. This concept is crucial in understanding the complex interactions between different viruses within a host.
**Why the Correct Answer is Right**
This phenomenon occurs due to the presence of a virus that produces an antiviral protein or interferon, which interferes with the replication cycle of the second virus. The antiviral protein can target specific viral enzymes, such as reverse transcriptase or protease, or disrupt viral RNA or DNA synthesis. Interferon, on the other hand, can activate immune cells to produce antiviral cytokines that inhibit viral replication.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it refers to a different concept, where a virus is unable to infect a host due to a pre-existing immune response or previous exposure to a related virus.
**Option B:** This option is incorrect as it refers to a phenomenon where a virus is able to manipulate the host cell environment to favor its own replication, rather than inhibiting another virus.
**Option C:** This option is incorrect as it refers to a concept where a virus is able to co-opt the host cell's machinery to produce new viral particles, rather than interfering with another virus.
**Clinical Pearl / High-Yield Fact**
The concept of interference between viruses is an important area of research in the development of antiviral therapies, as understanding how different viruses interact can lead to the discovery of new targets for treatment.
**Correct Answer: C. Interference.