CD40LG and 22q11.2 deletion syndrome: Significantly, more subspecialist immunologists than family practice physicians recommended avoidance of live viral vaccines for DiGeorge syndrome (61 vs. 26%, P < 0.05), hyper IgM (52 vs. 17%, P < 0.05), and Wiskott–Aldrich syndrome (57 vs. 23%, P < 0.05).