The human immunodeficiency virus type-1 (HIV-1) is the causative agent of the acquired immunodeficiency syndrome (AIDS) and its related disorders (Barré-Sinoussi et al. 1983). HIV-1 is commonly referred to as “HIV,” and HIV infection is a major health concern worldwide. In 2011 alone, an estimated 34 million people were infected with HIV and 1.7 million deaths were attributed to AIDS (UNAIDS 2012).