Yes.
And what about the minority that do?
It does reduce the spread by reducing viral load, and it protects the children that, for whatever reason, actually do have a bad reaction.
Which is now completely pointless because we have a chicken pox vaccine. My daughter is twelve and never had to get chicken pox and is quite protected, plus won’t get shingles when she’s an adult (which I managed to get in my twenties).
Absolutely not.
No they aren’t.
Absolutely.