Yes, last I heard they seemed designed to catch infection and be a training ground for the immune system, so it can deal with the issue faster if that particula

Yes, last I heard they seemed designed to catch infection and be a training ground for the immune system, so it can deal with the issue faster if that particular pathogen infects a more critical organ. Also similar to one of the reasons babies stick everything in their mouths, so they get samples of pathogens while they are healthy and can deal with it, rather than getting exposed later when they are sick and their immune system already stressed.