I AM A CLINICIAN IN A NATIONAL REFERRAL HOSPITAL AND

I AM A CLINICIAN IN A NATIONAL REFERRAL HOSPITAL AND I AM CURRENTLY WORKING IN HIV AIDS CLINIC. THERE IS THIS IMMUNOLOGICAL STATE OF FEW OF MY CLIENTS I DON'T UNDERSTAND IN A LEVEL WHEREBY I CAN EXPLAIN TO MY CLIENTS. I HAVE A CLIENT WITH LOW CD4 i.e below 100 c/mm FOR A PERIOD OF THREE YEAR BUT WITH UNDETECTABLE VIRAL LOAD AND CLINICALLY STABLE. IS THERE ANY SCIENTIFIC RESEARCH WHICH WHICH HAS BEEN DONE TO TRY EXPLAIN THIS PHENOMENON.