Hi Daffodil, Do you mind me asking if you experienced any improvement in health whilst taking AZT, when your NK cell function increased? Daffodil, one thing to point out, that you might not have considered, is that these complex pharmaceuticals often work via multiple unpredictable mechanisms that they don't fully understand. So they can affect our biology in multiple ways. For example, look at Rituximab... The improvements initially seen in CFS/ME patients were an unexpected side-effect when treating cancer. And we don't yet know why it treats CFS/ME... It might be because it helps to modulate a dysfunctional immune system, or it might be because it modulates the replication of a virus, etc. MAOIs (antidepressants) were discovered for depression the same way... They were treating some other unrelated disease and discovered that the patients' moods improved. So it is possible that AZT might be working on your immune system in some unexpected way, so that it increases NK cell function... It might purely be modulating your immune system rather than modulating viruses. I just thought I'd mention that in case helpful. But I'm open to all possibilities. Totally agree!