Indeed, Adrian Thrasher, the consultant paediatric immunologist at the Great Ormond Street Hospital who carried out the treatment, was more cautious.

• 虽然从各方面看起来里斯都很正常，但他的疾病仍有复发的风险，而复发会使他再一次易患机会性感染（会性感染常侵袭免疫系统受损的人）其实，开展这项治疗的大奥尔蒙德街医院的儿科顾问免疫学家阿德里安·拉舍要谨慎得多。