TABLE 2.

Clinical and laboratory findings in infants born to mothers immunized against HPA-9b (Max^a)

Case	Child	HPA-9b (Maxa) antibody present	Maxa type of infant	PLT nadir (×109/L)	Time (days) to reach PLT count of 100 × 109/L	Bleeding symptoms	ICH	Treatment	Outcome
1	1	Yes	Positive	5	18	Extensive petechiae at 12 hr	Small ICH	Random PLT transfusions, Days 1, 6, and 13	No neurologic sequelae
	2	Yes	Positive	6	10	Extensive petechiae and purpura at birth	Major ICH	Maternal and random PLT transfusion, Days 1 and 6	Permanent disability
2	1	Yes	Positive	20	5	Moderate petechiae at birth	No	None	Recovery
	2	No	Negative	225		None	No	None	Normal infant
3	1	Yes	Positive	7	18	Moderate petechiae at birth	Small ICH	PLT transfusion, Days 1 and 7	No neurologic
	2	No	Negative	235		None	No	None
4	1	Yes	Positive	6	30	Moderate petechiae at birth	No	IV gamma globulin at 3 and 4 weeks of age	Recovery
	2	Yes	Positive	237		None	No	Prenatal IV gamma globulin (last 2 months)	Normal infant
5	1	Yes	Positive	30	5	Moderate petechiae at birth	No	Random PLT transfusion, Day 2	Recovery
	2	Yes	Positive	231		None	No	Prenatal IV gamma globulin (last 2 months)	Normal infant