The human immunodeficiency virus (HIV) changes (mutates) often. Sometimes these changes make the virus resistant to a particular medicine or class of medicines, which means the medicine is no longer effective against the virus. When this happens, the medicine no longer controls virus growth (replication) or protects the immune system.
Resistance testing is done to determine whether resistance has caused treatment to fail and to identify antiretroviral medicines that can be used to treat the infection. There are many reasons that treatment fails, such as:
HIV is often linked with mental decline and worsening motor skills. When the virus attacks someone's nervous system, it can damage their brain and cause HIV-associated neurocognitive disorders (HAND).
Symptoms of HAND include at least two of the following:
Short attention span
Poor coordination and balance
Weakness in the a...