Sometimes, the "flu" really isn't the flu (influenza) at all, but rather a nasty virus. Viruses do tend to contagious a day before you were sick, and about two days later, but to count it down to the hour may be iffy. Viruses don't have watches, so it would may be possible to still pass it on for another day or so. Either way, you may end up getting blamed.
I don't know the age of your grandchild, but many over the age of six months have received a flu vaccination already, and those under six months may still have protection from maternal immunity, especially if the baby is breast fed.
Family members do not pass one virus back and forth to each other like a ping-pong ball, but they certainly can share any of the 200 or so known to cause respiratory illness, like colds.
Basically, your grandchild needs to toughen up a bit, so what better way to do this would be a lot of grandparent kisses. After 48 hours, I would say....take a chance, if the parents are agreeable. There are some things that we cannot avoid, and that would be viral illnesses. If you don't expose them, someone else will.
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