Yes, you’re right! A lentiviral vector is used to insert the working gene into the patient’s stem cells. Obviously this is a non-pathogenic version of the virus

Yes, you’re right! A lentiviral vector is used to insert the working gene into the patient’s stem cells. Obviously this is a non-pathogenic version of the virus, so it’s ability to make you ill has been essentially “switched off”. However the ability for the virus to insert genetic information into the DNA of cells remains.