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