Why is it that some doctos say that you do not have an active virus because the IgM is in range? If you have high IgG values are the viruses still active? Is there research that explains this? If so, please pass on the research. I need to understand why a patient needs to be treated for them. The viruses listed in the topic tags are viruses that my son had high IgG levels. I am confused by this issue and need to be educated.