I sure hope your wee girl does not catch them, they are bad enough when it is your toddler, my girl did not get them until she was 13 and she had been exposed to them at pre-school, was even in the same car ,and in close contact,as a person who later came down with them, so here's hoping.

Yes there is a vaccine nowadays, and has been for some time now.

You could give your son an antihistimane to take ,by liquid form, this really helps the itch, i did it for my daughter and it helped so much, luckily she did not scar much at all,and they were quite bad.

Fingers and all paws crossed here that Ariel does not get them, thinking of you all, hope your lil fella is doing ok and will soon be over them and feeling much better too.