Why do children cured by enzyme-replacement therapy for adenosine deaminase dediciency need periodic tratment ?

State the cause of adenosine deaminase enzyme deficiency.

The genetic defect adenosine deaminase deficiency may be cured permanently by

Explain enzyme-replacement therapy to treat adenosine deaminase deficiency Mention two disadvantages of this procedure.

Explain enzyme-replacement therapy to treat adenosine deaminase deficiency Mention two disadvantages of this procedure.

Explain enzyme-replacement therapy to treat adenosine deaminase deficiency? Mention two disadvantages of this procedure.

What is the permanent cure of adenosine deaminase (ADA) deficiency ?