3 ms·Germs cause disease. I know germ theory is pretty new but its established science.by bobsmooth 4y agoGerms cause disease. I know germ theory is pretty new but its established science.zamalek 4y agoGerms also cause immunity. You do need exposure (vaccines help, but aren't enough).afiori 4y agoIt is also suspected that germs keep us from being allergic to everything