I don't know about the silver, but have read in more than one place that food 
allergy underlies this problem in most cases. 
http://www.onlineallergycenter.com/theroleoffoodallergiesinearinfections/
 
My suggestion is to later try eliminating some of the major food allergens, 
which are: 
Milk and milk products 
White wheat 
Eggs 
Chocolate
Tomatoes and tomato products 
Citrus fruits and citrus juices 
 
See what happens. I was plagued by all kinds of infections as a kid and was a 
celiac (wheat allergy) and didn't know it.
 
Tish