Here it is (from Qld Health):
"There may be some swelling, redness and soreness where the injection was given and fever. A mild chickenpox-like rash may develop at the injection site or on the body. If this occurs, the rash usually appears about eight days after vaccination (but can appear any time between five to 26 days). People with this rash should avoid contact with people with weakened immune systems. More serious side effects are extremely rare."

So unless they have the rash they are OK.