title: [Dynamics of T lymphocyte subsets in SARS patients].
abstract: OBJECTIVE
  To study dynamics of T lymphocyte subsets in severe acute respiratory syndrome (SARS).
  
  
  METHODS
  Sequential anti-coagulated blood samples were collected from 46 cases of SARS patients during the 1st week, the 2nd week, the 3rd-5th week and the 8th-12th week after the infection. T lymphocyte subsets including CD3+CD4+ cells, CD3+CD8+ cells, naive CD4+ cells (CD4+CD45RA+CD62L+) and activated CD8+ cells (CD8+CD38+) were detected by 3-color flow cytometry. Fifty-six normal healthy blood donors were also detected as normal controls.
  
  
  RESULTS
  Compared with the results of normal controls, both of the percentages of CD4+ cells and CD8+ cells of SARS patients were in normal levels during the 1st week, but the cell counts decreased significantly to (306 +/- 140)/mm3 and (270 +/- 143)/mm3, respectively. The cell count of naive CD4+ subset also remarkably decreased to (96 +/- 49)/mm3, and the percentage of CD8+CD38+ subset was higher than that of normal controls [(59.3 +/- 12.6)% vs (44.9 +/- 12.5)%]. During the 3rd-5th week, the CD8+ cell count and the percentage of CD8+CD38+ subset reached normal values, which were (581 +/- 356)/mm3 and (40.1 +/- 17.6)%, respectively. During the 8th-12th week, the cell counts of CD4+ cell [(578 +/- 193)/mm3] and naive CD4+ subset [(176 +/- 64)/mm3] were still less than those of normal controls, while compared with those of the 1st week, the increments were remarkable.
  
  
  CONCLUSIONS
  T lymphocytes of SARS patients decreased dramatically but could be obviously resumed in a short time. It will take more than 8-12 weeks for CD4+ cell and naive CD4+ subset to reach to normal levels.
authors.affiliation: Department of Infectious Disease, PUMC Hospital, CAMS and PUMC, Beijing 100730, China. qiu_Zhifeng@hotmail.com
authors.forename: Zhi-feng
authors.initials: ZF
authors.lastname: Qiu
authors.forename: Tai-sheng
authors.initials: TS
authors.lastname: Li
authors.forename: Hong-wei
authors.initials: HW
authors.lastname: Fan
authors.forename: Yang
authors.initials: Y
authors.lastname: Han
authors.forename: Jing
authors.initials: J
authors.lastname: Xie
authors.forename: Ai-xia
authors.initials: AX
authors.lastname: Wang
authors.forename: Guo-hua
authors.initials: GH
authors.lastname: Deng
mesh_terms: D000328:Adult; D018791:CD4 Lymphocyte Count; D016516:CD4-CD8 Ratio; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D045169:Severe Acute Respiratory Syndrome / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology*