Its dangerous for infants and old people
I would just try to keep your wands washed well. Try and keep your older child away from the LO as much as possible. Try to limit the touching and kissing is what I mean. Just watch for fevers in both children and if you feel either are for sure geting sick with it call their pediatrician.
keeping DD from touching/kissing DS seems pretty impossible...even when i tell her no and try to keep her away she always finds a way to sneak in a kiss and a hug. she is kind of obsessed with him.
all of us wash hands a lot and our house is usually very clean. but i just read another article that says kids can go up to 21 days without any symptoms. so there is a chance they both already have it and i wont know for another week or two...or three...
so far both are acting very healthy and normal. i had the chicken pox and i am ebfing DS, i hope it will help him IF he has it/gets it.