The world of bacteria - the army of beneficial bacteria

There is a battle that is going on inside you!
All kinds of germs want to invade your body, but fortunately, you have a great device whose mission is to defend you, is: your immune system. This device uses a great army of bacteria that live in your guts to do the task of permanent monitoring, suggest solutions, and it is responsible for the number of ingenious defenses. Thus, the leader of bacteria, and his band consisting of immune system officers maintain your health.