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.
Pre-Exposure Prophylaxis, or PrEP, is a new HIV prevention strategy in which HIV-negative people use HIV antiretrovirals (ARVs), drugs usually used to treat HIV infection, to reduce their risk of becoming infected with HIV.re-Exposure Prophylaxis, or PrEP, is a new HIV prevention strategy in which HIV-negative people use HIV antiretrovirals (ARVs), drugs usually used to treat HIV infection, to reduce their risk of becoming infected with HIV.