Originally Posted by
Artpen100
However, to try to avoid all viruses and bacteria could have an adverse effect - the immune system will not have been tried, and will have insufficient antibodies when, inevitably, the person catches something. That could have a worse effect than some small colds or flu along the way.
No. Except if you live in a sanitary bubble because of a marrow bone cancer, this is really not how this works. Your immune system is tried constantly, every time you eat, brush your teeth, touch your mouth or nose.