The syndrome DiGeorge is basically the abnormal development of the Thymus, in other words by the deletion of a portion of chromosome 22. The result of the undeveloped thymus can cause children high risk and susceptible to infections by viruses, fungi and protozoa. Some of the common infection start when they are young for example: measles, mumps and chickenpox also can be fatal in some children.
Also other symptoms included their growth, wasting of the body some of the facial characteristic in some case can increased of the lymphatic cancer. With lab work and CT scan is important to have done these test to discovered early so you can help them with immunization with live vaccines blood