An Adverse Event (AE) is defined as any untoward medical occurrence in a participant administered a pharmaceutical product and which does not necessarily have a causal relationship with this treatment. A list of all adverse events is reported in the "Other (Non-Serious) Adverse Events" section. Non-serious AEs were not collected during the Individualized Follow-up Period.

A CAE=treatment-related (TR) grade (G) \>=3 AE on day of infusion (inf.) preventing inf. to be resumed, a TR G 3 bronchospasm during 1 inf., an AE whose severity becomes G 3 for the third time during 1 inf., infections reported as serious, a TR neurological event consistent with progressive multifocal leukoencephalopathy (PML), any malignancy, and any fatal adverse drug reaction. AE severity (assessed as G 1-5) was classified using the Common Terminology Criteria for Adverse Events v3.0: G 1=mild AE; G 2=moderate AE; G 3=severe AE; G 4=life-threatening or disabling AE; G 5=death related to AE.

Participants are checked for negative (or a lack of) HAHA at Baseline, and then throughout the study, to ensure that the investigational product is not causing HAHA development. Participants with concentrations of Ofa that are missing or are above 500 nanograms per milliliter (ng/mL) are considered to have unconfirmed HAHA results.

The investigator performed the physical examination, which included but was not limited to: general appearance and the following body systems: lymph nodes, mouth and throat, lungs, cardiovascular, abdomen, extremities, muscular-skeletal, neurological (apart from multiple sclerosis \[a brain and spinal cord disease\]), and skin. All abnormal clinically relevant findings such as vein problems (venous varices), disorder of the vertebral column (vertebropathy), increased hearing loss, post operative mark (scar), and chronic skin disorder with no sweat and itching (anhidrotic eczema) were reported.

Blood samples of participants were collected for hematology assessment. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) in basophils, eosinophils, leukocytes, monocytes, lymphocytes, neutrophils, and platelets count was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Week 104 for the IFUP minus the value at Baseline.

Blood samples of participants were collected for assessment of erythrocyte count. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) in erythrocyte count was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline.

Blood samples of participants were collected for hematocrit assessment. Hematocrit is the percentage of blood volume (BV) that is occupied by red blood cells (RBCs). Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) in hematocrit was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline. Hematocrit is measured as a percentage, i.e., volume (V) of red blood cells per volume of blood.

Blood samples of participants were collected for assessment of hemoglobin count. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) in hemoglobin was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline.

Blood samples of participants were collected for assessment of albumin count. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 104 for the IFUP) in albumin was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline.

Blood samples of participants were collected for the assessment of alkaline phosphatase, AST, and ALT. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline.

Blood samples of participants were collected for the assessment of bicarbonate, glucose, potassium, and urea. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline.

Blood samples of participants were collected for the assessment of bilirubin and creatinine. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline.

Blood samples of participants were collected for the assessment of antibodies produced by B-cells (immunoglobins): immunoglobulin A, immunoglobin G, and immunoglobin M. Change from Baseline (Week 0 for the FTP, Week 24 for the STP, and Week 0 for the IFUP) was calculated as the value at Visit 10 (Week 24) for the FTP, the value at Visit 17 (Week 48) for the STP, and the value at Visit 26 (Week 104) for the IFUP minus the value at Baseline.

Maximum (systolic) and minimum (diastolic) BP were assessed prior to infusion. Change from Baseline (Week 0 for the FTP and Week 24 for the STP) was calculated as the value at Visit 10 (Week 24) for the FTP and the value at Visit 17 (Week 48) for the STP minus the value at Baseline.

The pulse rate of each participant was assessed prior to infusion. Change from Baseline (Week 0 for the FTP and Week 24 for the STP) was calculated as the value at Visit 10 (Week 24) for the FTP and the value at Visit 17 (Week 48) for the STP minus the value at Baseline.

The temperature of each participant was assessed prior to infusion. Change from Baseline (Week 0 for the FTP and Week 24 for the STP) was calculated as the value at Visit 10 (Week 24) for the FTP and the value at Visit 17 (Week 48) for the STP minus the value at Baseline.

Blood samples of participants were collected for CH50 prior to and 2 hours after dosing, and the samples were sent to a Central Laboratory for analysis: Bio Analytical Research Corporation (BARC). Change from Baseline (Week 0 for the FTP; Week 24 for the STP) was calculated as the value at Weeks 24 (FTP) and 48 (STP) minus the value at Baseline. Ofa depletes (induces the cell death of) B cells. When Ofa binds to a B cell, it induces complement CH50, which in turn causes cell death via cytotoxicity. Therefore, the CH50 levels were measured to ensure that CH50 was being appropriately activated.