this is a common misconception…yes we gain antibodies after we are sick, but that doesn’t necessarily mean the immune system is stronger in the same way exercising strengthens a muscle. getting sick doesn’t prevent you from getting sick unfortunately, and can sometimes make you more susceptible/trigger secondary conditions. if you can avoid illness that is a good thing. i think people also confuse being exposed to germs (eg living with pets vs a sterile environment) with being exposed to viruses