This is a karmic imprint, you can also describe as a trauma imprint, from his recent illness. This requires some further healing yet and the way his body is interpreting the trauma memory of his recent illness is causing it to recapitulate symptoms of infection. So it is confusing the past with the present, and in the energetic flow of things in the body the presence of this dramatic encounter with illness gets noticed. This is not simply dismissed as a relic of prior experience but a continued presence of a foreign invading onslaught, and this triggers some aspects of an immune response causing fever as a symptom. The appearance of elevated body temperature, called a fever, is a normal self-defense strategy by the physical body because some organisms are more readily killed and eliminated when there is a higher body temperature for a time. So there are robust mechanisms to trigger that happening quickly when microbes are present and begin to multiply. That begins with an immune recognition something is out of balance and when interpreted as a foreign intruder will go into action to start a battle with whatever that stimulus is, to get things rolling. In this case, it is a memory of trauma and what was out of alignment during that illness, maintained as a memory of the bodily changes, and as such, it can be mistaken by the immune system as a return event, that the invaders are back again and there needs to be another battle mounted for self-defense. This was not harmful and will fade in time because it is not productive. Being a re-expression of the trauma memory, it is not contagious and will not be harmful to your son, but an inconvenience and then annoyance for him, of course. Additional work with the LHP will be helpful because it does address problems lodged within cellular memory, and that is what is causing the renewed fever.
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