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Also note the qualifier: "in their blood cells". HIV reservoirs are not necessarily restricted to blood or blood cell types.

You would expect that these patients need HAART to prevent a reactivating virus from replicating. The Berlin patient is different* because particles generated by a reactivated CCR5-tropic virus cannot infect his new T-lymphocytes.

* though it remains to be seen whether he is truely cured.

You can easily detect HIV in people taking HAART.

That depends on what test you run IIRC.