After consulting with our medical advisors we should be aware that, whilst very interesting and encouraging, these findings do need to be replicated in other laboratories. This is not the first time that a retrovirus has been suggested to play a major part in ME/CFS, and before it was sadly found to be a false dawn. We also need to be aware that, even if an association is confirmed, we don't yet know if it is a cause or a consequence of ME/CFS. It would be premature to think about tests and treatments until we know very much more. On the other hand, this finding will encourage more biomedical research that will increase our understanding of ME/CFS. The message from our advisors is that, although this is a very interesting advance, we should not get too excited about this until we know more.