With hand sanitizer brands crusading against germs (viruses, bacteria, et al.) and promising the removal of 99.9 per cent germs, we have started believing that these microorganisms are real villains in our body. Yes, they can be dangerous, ushering in a host of diseases that are quite difficult to tame. However, not all germs are the bad guys. There are the good ones as well who protect us from a number of ailments. General wisdom in the field says that human body is home to more than 90 trillion microbes (microscopic organisms including virus, bacteria, fungi, etc.). Many of them