An Extension Study Assessing the Safety and Efficacy of AVTX-803 in Subjects With Leukocyte Adhesion Deficiency Type II

Inclusion Criteria: * Subject must have completed protocol AVTX-803-LAD-301 * Subject has biochemically and genetically proven LAD II (SLC35C1-CDG) Exclusion Criteria: * Subject has severe anemia defined as hemoglobin \<8.0 g/dL (\<4.9 mmol/L) * Subject has impaired renal function as defined by an eGFR \<90 mL/min * Subject has known or suspected intolerance or hypersensitivity to fucose or any ingredients of the investigational product * In the investigator's opinion, subject has a history of failure to respond to fucose at adequate dosing