This.
I would still quarantine your snake. ALL new additions need to be kept seperate. because of their slow metabolism, it may take weeks for an infection to start showing itself on a snake. If you have them all together, then you've exposed all your other animals to the same sickness.
Congrats on your new baby! My mother got me a male corn snake (for one of my females) for Christmas and I'm purchasing myself a 2000g female normal ball python! New additions are wonderful.