<qa>  What is the name of the group that is characterized with CD4 T cells less than 200Advanced AIDS patients are usually characterized with CD4 T cells less than 200 cellsuL, including end-stage AIDS patients CD4 T cells less than 50 cellsuL, and often accompanied with severe opportunistic infections including tuberculosis, PCP, fungus and so on and deadly complications.In this regard, advanced AIDS patients present a unique and special profound immune deficiency setting. Therefore, increasing attention and evidence have been paid to development of novel immune therapeutic strategies for those patients. 