The way AIDS virus brings itself back to life after the use of powerful drugs wasn’t less than a mystery for medical researchers.

But now a new study says that HIV can lie dormant inside some cells (it can be even a single cell) until emerging again to cause destruction.

Huldrych Gunthard, a researcher at University Hospital Zurich, in Switzerland, who is co-author of the study says that their findings are indeed good news, as they suggest that virus doesn’t replicate itself when dormant.

Such drugs are available in the market since the mid-1990s that allow many AIDS patients to decrease the level of the virus in their blood to zero, but the disease remains incurable. Gunthard says that the virus can hide itself in the lymphatic system, bone marrow, brain and in other places in the body.