Kids aren’t exactly germ bags or carriers of disease but they have a immature immune system and being in close contact with the public including shopping malls, movies, whatever they can catch things easier so they’re most vulnerable and if they get sick their immature immune system can’t fight it off as well and can pass it on easier basically where a adults immune system will immediately kick Im and not make it as volatile to pass. That’s how they developed a stronger immune system though. Also kids just vaccinated can sometimes shed the virus to others for a time. That’s what some suspect happened at Disneyland. Also ironically only a small percent wernt vaccinated. I and some of my family were there around that time had no problems although I’m naturally immune. It also seems strange to me that since they started pushing all these flu vaccines kids are getting the flu every year where it used to be only once or twice at most during childhood. I don’t even remember any Flu epidemics where kids or my siblings out with it. Now it’s common and more frequent especially if they have siblings.
Ironically what I noticed in hospitals that people with COPD did well during epidemics. People could be dropping like flys around them and they were hanging in there most times untouched. I’m talking about the adults not kids but it seemed to be a pattern. Upper respiratory issues though much care to try not to pass it or treated immediately if showing symptoms because it makes it 50 times worse if they get it, even a cold. Although vitamins appeared to help prevent something’s along with their own immune system.