The case of an infant with multiple, rapidly progressive, soft-tissue infec
tions is presented. Despite features suggesting a neutrophil disorder, resu
lts of screening tests of phagocyte function were normal. A novel, multifac
eted Leukocyte disorder-distinguished by defects in shape change, chemotaxi
s, ingestion, degranulation, superoxide anion production, and bactericidal
activity-was established secondary to a defect in Rac2.