https://jamanetwork.com/journals/jam...rticle/2768391
Children get the disease. That makes them a "vector", since it spreads at the very least through aerosols, if not straight airborne.
Viruses reproduce in any human, and spread. Not sure why this is a difficult concept for you, but then again, you lick Trumps boots, so that indicates an ability to grasp basic concepts common to normal humans.
For them not to be a vector, you would have to prove that the version of the virus that children get is different than that of adults, or that this virus magically does not reproduce itself in children. Given that they do get sick, this is a heavy burden on your part. Have at it, boot licker.