HIV drugs stop the virus from making copies of itself.
This reduces viral load to very low levels. Your CD4 count then has a chance to grow stronger again.
When not on treatment, your immune system works in overdrive. HIV infects CD4 cells and makes more virus.
Your body produces new CD4 cells to fight the virus. Then HIV uses these new cells to produce more virus. It is like a dog chasing it’s own tail.
Over time, and without ART, your immune system gets worn out.
When not on treatment, your immune system works in overdrive