Science Focus - the home of BBC Science Focus Magazine
Are there any viruses which are beneficial? © Getty Images

Are there any viruses that are beneficial to the human race?

Subscribe to BBC Science Focus Magazine and get 6 issues for just £9.99

A mild virus could protect you against a more serious illness.

Asked by: Richard Powling, Woodbridge


Viruses work by invading the host cell and forcing it to make lots of copies of the virus. This normally kills the cell in the process and is therefore a bad thing. But your immune response to a mild virus might protect you from a more serious infection: cowpox infections immunise you against smallpox, for example.

Alternatively, you could be a carrier for a virus that doesn't hurt you much but is much more serious for a competing species: chimpanzees carry an immunodeficiency virus that can be transmitted to gorillas (for example when fighting), though I don't know of an example in humans.

Finally, there have been some early trials in mice with viruses that appear to target tumour cells and kill them, including the Sindbis virus, which is transmitted by mosquitoes in Egypt.

Read more:


Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.


luis villazon
Luis VillazonQ&A expert

Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.


Sponsored content