functional obsolescence. Impairment of the usefulness of a device or equipment due to a design defect, or due to its inability to be upgraded or modified to serve the user's current needs.efinition. Impairment of the usefulness of a device or equipment due to a design defect, or due to its inability to be upgraded or modified to serve the user's current needs. For example, a relatively new computer becomes functionally obsolete if it cannot run the latest program or peripheral the user wishes to use.
Current US DHHS guidelines (published April 8, 2015) state: 1  Antiretroviral therapy (ART) is recommended for all HIV-infected individuals to reduce the risk of disease progression. 2  ART also is recommended for HIV-infected individuals for the prevention of transmission of HIV.
There's no cure for HIV/AIDS, but a variety of drugs can be used in combination to control the virus. Each class of anti-HIV drugs blocks the virus in different ways. It's best to combine at least three drugs from two classes to avoid creating strains of HIV that are immune to single drugs. The classes of anti-HIV drugs include: Non-nucleoside reverse transcriptase inhibitors (NNRTIs).