TBX1 and 22q11.2 deletion syndrome: During the 6-year study period, our institution cared for a total of 28 infants with DiGeorge syndrome (DGS) including 26 infants with 22q11.2 deletion and 2 infants with heterozygous pathogenic variants in TBX1 who had undergone newborn SCID screening (Table 3 and Figure 3).