What are they calling viruses, though? Tiny bits of DNA and RNA that are ubiquitous in humans and that have never been proven to cause disease.

Only about 10 percent of the cells in the human body are actually human cells — the rest are fungi, bacteria, viruses or other non-human cells. The human gut alone has over 100 trillion microbial cells, but only about 1 percent of all the microbiota on and in the body has actually been identified. Researchers estimate that the non-human microorganisms in and on a human body outnumber the human cells by a factor of 10.

https://www.wise-geek.com/what-percent-of-cells-in-the-human-body-are-non-human-cells.htm