To determine the CD₃₀ expression on peripheral blood T lymphocyte subsets in patients with hemorrhagic fever with renal syndrome (HFRS) and its clinical implications, double immunofluorescence technique and flow cytometry were used. There was no significant difference among the severe group, mild-moderate group and normal control group in the CD+CD₃₀ T lymphocyte subset. While the CD₄⁺CD₃₀⁻ T cells of HFRS patients were increased and the difference between severe group and mild-moderate group or normal control group were very significant (P<0.01) and the difference between the mild-moderate group and normal control group was also significant (P<0.05). The CD₈⁺CD₃₀⁻ T cells were increased while the CD₈⁺CD₃₀^- T cells decreased obviously in HFRS patients, and the differences among three groups in both subsets were very significant (P<0.01). The results showed that the humoral immunity and cellular immunity are overactive in HFRS patients during acute phase. The loss of balance between T lymphocyte subsets may play an important role in the pathophysiology of HFRS and is closely correlated with the severity of the HFRS.

To observe the effect of growth hormone on serum leptin levels, serum leptin concentrations were measured by enzyme immunoassay in 12 prebutal children with growth hormone deficiency 1, 3 and 6 months before and after the treatment with recombinant human growth hormone (r-hGH). For comparison, 34 normal prepubertal children were also investigated. Relationship between leptin levels and body mass index (BMI) was observed at the same time. Our results showed that serum leptin level in normal prepubertal children was 1. 22±0. 34 ng/ml; the pretreatment serun leptin levels in GHD children was 3. 08±2. 41 ng/ml, which was significantly different from those 1, 3 and 6 months after GH treatment (i. e. 1. 64±1. 37 ng/ml,1. 57±1. 40 ng/ml and 1. 35±0. 89 ng/ ml respectively) (allP<0. 001). Our results suggested that r-hGH has a suppressive effect on leptin expression.