Many people over here don’t even know that technically they are not alone as an individual. They have millions and billions of lives walking and existing along with them on a lifetime basis. Best part? we humans are not able to recognize these lives through naked eyes. Yes! They are not humans. Nope, they are not even ghosts! These are billions of microorganisms called by the name “normal flora”.
Thinking of micro-organisms we recall bacterias, virus, fungi, etc. but you also remember that they are supposed to harm human body as different diseases like malaria, polio, common cold, etc. Case in point; If they are so harmful to us then why do they exist along with us? Then too in billions of quantity? That is because they exist to help our body in performing different tasks, such as digestion, making immune system strong, etc.
Now how can a microorganism, a normal flora, can make our immune system strong? It’s all because of competetion. ‘Competition’ is a literal term given to the process of microorganisms competing for food, shelter, nutrient, etc. which are performed by them through a human body. They compete with other incoming bad microorganisms which have potential to cause various diseases. Thus, normal flora plays a critically important role in our immunity.