The Coxsackie A and B viruses are groups of viruses known to science. The Mood virus (aka as the chronic sore throat virus) appears to be a type of Coxsackie virus which is unknown to science. These viruses turn off the life force going into the thymus gland (just above the heart), and so seriously weaken the immune system. In fact one or more of these viruses usually makes Lyme much worse than normal.