Professor Karina Butler:

That is a subdivision of the chronic symptoms that have been reported by people associated with Lyme disease. It is for clarification that this is divided into two subgroups, namely, those who have seropositive evidence, that is, those who have had confirmed Lyme infection, and those who have never tested positive for infection but have symptoms that they attribute to Lyme disease. The WHO in its classification has embraced these two groups. For the purpose of clarification, and to explain the matter to the committee, we have adopted the more clinical definitions, that is, this subdivision. I hope that is clear.