I really, really want this study to be true, and maybe on a broad scale it is. However, in my kids, I have seen mostly the opposite. My 11 year old was almost fully vaccinated until she was around 5. She didn't have her first ear infection until she was 3. She had a few illnesses, but nothing serious, and even now, she rarely gets extremely sick. On the flip side, my completely unvaxed 3 year old gets sick several times a year, and when she gets even a minor cold, she winds up with very high fevers (103+). She has had probably 5 ear infections, and she gets sick pretty much every time we are around other kids (even if they are not sick). Time will tell how my (also unvaxed) 10 month old's immune system develops.