[MHGinTN]

If upwards of 80% of the population has this virus, why is cancer found in such a high percentage of the population (higher than 20%)?

[fr_freak]

If upwards of 80% of the population has this virus, why is cancer found in such a high percentage of the population (higher than 20%)?

Not sure. But a key to that question, assuming that this AAV-2 does kill cancer cells, may be in the quote from the article below:

AAV-2 is a small virus that cannot replicate itself without the help of another virus. But with the help of a second virus it kills cells.

They don't mention the other viruses. Trade secret? Anyway, maybe most people lack one of the crucial partner viruses.

[rmh47]

If upwards of 80% of the population has this virus, why is cancer found in such a high percentage of the population (higher than 20%)?

Actually, only about 20 to 25% of people (in the USA) will ever get cancer of any kind in their lifetimes. Also, the article stated that the virus kills cancers of the epithilial cells, which covers many, but not all, types of cancers.