Have you ever wondered exactly how your immune system works? Or how natural immunity differs from vaccine-induced immunity when it comes to SARS-CoV-2, the virus more popularly known as COVID-19? Despite all the complicated terms you may read in the news, it’s actually quite simple—once you understand the basics and understand the soldiers and engineers in your body fighting to keep you safe. Immunology 101 The human immune system is incredibly complex. In simplistic terms, it can be divided into two main branches: the innate and the cellular or adaptive immune systems. The innate immune system is akin to soldiers acting as sentries guarding the fortress, the first line of defense against foreign invaders. These sentries are constantly on guard at all portals of entry into the fortress of the body such as the nose, sinuses, mouth, throat, lungs, the whole length of the stomach and intestines, the eyes, and …