Miofobia or misofobia? The miofobia is the irrational fear of rats and mice. Of mys myos, mouse, muscle and phobos phobou, fear. The irrational, disproportionate and persistent fear misofobia to contamination of germs and therefore trend obsession by the cleaning of hands. They say that Donald Trump has this problem. Wash your hands frequently is a good measure to prevent colds and flus, but without obsessing.