I think you are the first to post regarding a 7 year old. I agree with the advice and foods listed so far. I have battled Chronic EBV for 10 years. The best treatment for me is 500 mg ( maybe lower though for a 7 year old! ) Of L-lysine daily. That and a good brand of B-6 and B-12 for energy, Alpha Lipoic Acid for cell renewal, and EXERCISE as hard as it is to do it, I feel amazingly better after having an enjoyable fun and active activity. The huge one for me was the L-Lysine. Good luck. So sad.