That's why my kids get a small dose of adult medicine now.
Vitamin D-3, the best placebo of all. My wife is an elementary schoolteacher and has always brought home whatever colds and flu were going around at school. This year we commenced on a regimen of 10,000 iu of D3 daily, equivalent to an hour or so of sunshine in the summer, This school year H1N1 and a couple other types of flu made the rounds and a couple of cold type things. Wife brought none of it home.