Susan and joe were worried. their little boy, daniel, had been having an awful lot of bacterial infections and he was barely a year old. it seemed that the antibiotics cleared up one bacterial respiratory infection only to have another follow shortly. the scary thing was that daniel had just fought o? a case of pneumonia caused by pneumocystis carnii, a fungal infection that was usually found in people with hiv. waiting for the test results of an hiv test for their little boy was one of the worst waits ever. goodness it came back negative. however, it seemed that their troubles were just beginning. after this last lung infection, the fungal one, and a negative hiv test, their doctor had ordered a number of other blood tests, including a genetic test that susan didn’t fully understand. apparently the doctor was worried about daniel’s immune system functions. susan had also met with a genetic counselor who collected a family history of any immune disorders. the details were vague, but susan’s mother, helen, knew that one of her three brothers had died young from an unexplained lung infection.