Hmmm, the best way to build up one's immune system is by detoxing (detox baths, foot baths, dry skin brushing, infrared sauna, etc.) not to mention a healthy diet and exercising if one can.
It's all about Detoxing Daily, strengthening the Immune System mixed with a dose of Positive Thinking!
This song is about my years with chronic lyme since 1995 and being symptom free for over 4 years: http://www.youtube.com/watch?v=ds81S61UvPA
Currently taking Estrovera, ProgX (progesterone), Adrenotone Plus, CoQ10, Vitamin B Total, C, Green Vibrance, CALM (Magnesium/Calcium)