Humans have “good bacteria”, but what about “good viruses”? (Part 2)

We hear about humans having and needing “good bacteria”. Are there similarly “good viruses” in our bodies? (continued)

Penny Jackson,

Barrow-in-Furness, Cumbria, UK

In addition to the bacteriophages discussed in previous responses to this question (31 December), there are a few viruses where an infection appears to be beneficial. For example, herpes seems to give the immune system a boost to resist infections by certain bacteria.

There is also a surprising benefit to infection by some retroviruses, which are types of viruses that integrate into the host cell’s DNA, modifying the genetic code. This integration can be permanent. It can…