Observational Study of Subcutaneous Immunoglobulin (Cutaquig) in Patients With Primary and Secondary Immunodeficiency.

Primary and secondary immunodeficiency diseases (PID and SID, respectively) affect the development and/or function of the immune system, resulting in increased frequency of infection. Treatment of these disorders using Cutaquig® (a subcutaneous immunoglobulin infusion (SCIG)) was licensed in Canada in 2018 and has proven to be effective in preventing significant infection. Other brands of SCIG can be given by the participant using a syringe (called rapid manual push method), which shows the same efficacy as administration by a programmable pump. The rapid manual push method has the potential to improve quality of life, reduce infusion time, and reduce the cost of administration. This study will evaluate the safety, tolerability, and patient satisfaction of Cutaquig® by the rapid manual push method in participants with PID or SID. It will also compare the efficacy of Cutaquig with prior SCIG treatment, if applicable, in participants with PID or SID.