The immune system is no wimp. When pathogens cause illness, it kicks into high gear. Cells work together to tag, kill and gobble up invaders as they fight the infection.
While these cells go on the offensive, other parts of the immune system store away information and learn as much as they can about the pathogen. This process helps to build immunity, so if the bug ever comes back again, the immune system will be able to detect and destroy it, preventing the person from developing the illness again.
Watch the explainer above to learn more about antibodies, immunity, and what they mean for Covid-19.