What percentage of medical cases of depression are actually caused by a virus such as Epstein-Barr or a Lyme disease virus?

We would say this is approximately 60% of clinical depression. This as well will produce inevitably a worsening through the triggering of many prior karmic episodes from the current life and parallel lifetimes as well, because the mind will go looking for what it knows about being in this state of depletion and unhappiness, and will find many parallel circumstances that may have been viral or simply life circumstances causing a devastating calamity of some kind and interfering with life happiness or even survival. So there will be a confluence of factors many times in such individuals. It is almost impossible to not be triggered by a physical set of symptoms causing emotional distress in some form without reawakening memories of past trauma carrying that same energetic signature. But when the cause in the first instance is viral, there will need to be a solution that addresses the virus and what it is doing in order to be fully treatable. So there is room for a multipronged approach here to address the various liabilities and kinds of inadequacy in the current life experience, as well as dietary things that can help to bring a person back into better balance, as well as emotional healing in a very deep way for the deep karmic roots that will be referenced and contributing greatly to having a bleak outlook on the part of the deep subconscious. When the deep subconscious is unhappy, the person will be in trouble because this will be evident through having dark emotions, as well as the physiologic signs of stress to varying degrees.