- Diagnosis of a PID disorder as defined by World Health Organization criteria1 for which the subject had been receiving a regimen of weekly or biweekly (every-other-week) subcutaneous IgG infusions or IGIV infusions every 21 to 28 days over a period of at least 8 weeks pre-study at an equivalent of a 4-week dose of 300 to 800 mg/kg bodyweight