Acquired Immunodeficiency Syndrome; Alphaproteobacteria; Central Nervous System Bacterial Infections; Cerebrum; RNA, Bacterial; RNA, Ribosomal; Acquired Immunodeficiency Syndrome/complications; Acquired Immunodeficiency Syndrome/genetics; Acquired Immunodeficiency Syndrome/metabolism; Acquired Immunodeficiency Syndrome/pathology; Alphaproteobacteria/genetics; Alphaproteobacteria/metabolism; Animals; Autopsy; Cats; Central Nervous System Bacterial Infections/etiology; Central Nervous System Bacterial Infections/genetics; Central Nervous System Bacterial Infections/metabolism; Central Nervous System Bacterial Infections/microbiology; Central Nervous System Bacterial Infections/pathology; Cerebrum/metabolism; Cerebrum/microbiology; Cerebrum/pathology; Feline Acquired Immunodeficiency Syndrome/genetics; Feline Acquired Immunodeficiency Syndrome/metabolism; Feline Acquired Immunodeficiency Syndrome/microbiology; Feline Acquired Immunodeficiency Syndrome/pathology; Female; Humans; Male; Mice; Mice, Knockout; Neuroglia/metabolism; Neuroglia/microbiology; Neuroglia/pathology; RNA, Bacterial/genetics; RNA, Bacterial/metabolism; RNA, Ribosomal/genetics; RNA, Ribosomal/metabolism