Its late genes, including vpr, vpu, and vif, require Rev to be expressed, while its early gene Nef, or negative factor, is the first protein to be detectable following infection with it.  It was originally discovered by a group searching for a common cause behind a cluster of Pneumocystis carinii pneumonia.  Two strains are known to infect humans, though one is more virulent and classified into three groups, one of which is further broken down into nine subtypes plus circulating recombinant forms.  A member of the lentivirus family, infection with it is typically treated with reverse transcriptase and protease inhibit
Its late genes, including vpr, vpu, and vif, require Rev to be expressed, while its early gene Nef, or negative factor, is the first protein to be detectable following infection with it.  It was originally discovered by a group searching for a common cause behind a cluster of Pneumocystis carinii pneumonia.  Two strains are known to infect humans, though one is more virulent and classified into three groups, one of which is further broken down into nine subtypes plus circulating recombinant forms.  A member of the lentivirus family, infection with it is typically treated with reverse transcriptase and protease inhibitors.  FTP name this virus that infects CD4 positive T cells in over 30 million people worldwide and causes AIDS.
Its late genes, including vpr, vpu, and vif, require Rev to be expressed, while its early gene Nef, or negative factor, is the first protein to be detectable following infection with it.  
Human Immunodeficiency Virus