Table 2. Laboratory findings of 11 children with COVID-19 infection.

Number	Blood routine			Lymphocyte subgroup analysis								Cytokines						CRP16	PCT17
	WBC1	LYM2		LYM3	T%4	CD4+ T%5	CD8+ T%6	CD4+ T/CD8+T7	NK%8	B%9		IL-410	IL-611	IL-1012	IL-1713	TNF-α14	IFN-γ15
1	5.7	3.28		7,587	77.72	52.68	23.6	2.23	10.36	11.66		7.07	8.94	4.35	3.21	26.28	16.8	0.15	0.043
2	6.8	4.54		4,717	62.94	34.88	25.42	1.37	10.56	26.9		1.71	11.6	3.96	1.57	12.01	7.31	0.07	–
3	6.2	3.72		2,700	73.13	37.76	22.42	1.68	6.28	20.34		4.78	8.13	2.88	2.03	15.94	9.76	7.81	0.050
4	5.3	2.11		1,883	76.18	34.52	32.2	1.07	5.48	17.5		1.78	5.75	2.69	1.43	6.65	5.64	0.05	0.046
5	6.5	2.47		2,102	65.27	29.64	21.94	1.35	20.88	18.5		3.58	85.2	3.38	1.37	12.7	21.7	0.52	0.036
6	6.2	2.7		2,549	71.14	25.66	39.06	0.66	9.86	18.5		2.88	4.25	2.59	1.33	10.79	9.04	0.00	0.041
7	5.2	1.6		1,375	75.92	44.62	27.64	1.61	6.14	18.1		1.75	8.13	2.36	1.19	3.56	4.89	0.08	0.032
8	9.4	2.39		2,236	71.13	39.86	27.7	1.44	6.02	22.3		2.57	5.46	2.67	1.38	7.56	9.8	0.09	0.022
9	4.1	1.25		1,139	74.23	32.44	31.42	1.03	6.32	16.8		1.98	4.48	2.11	1.54	5.56	4.26	55.0	0.097
10	4.7	1.31		1,755	71.83	49.92	21.7	2.30	19.7	8.56		1.07	0	2.68	1.28	0.82	4.51	2.07	0.071
11	3.7	1.57		1,675	66.63	32.68	31.8	1.03	23.56	9.06		1.71	0	2.31	1.13	3.22	3.68	3.95	0.032

Reference ranges: ¹, white blood cell count [(3.5–9.5)×10⁹/L]; ², lymphocyte count [(1.1–3.2)×10⁹/L]; ³, lymphocyte count (1,530–3,700 μL/h); ⁴, T lymphocyte% (55–84%); ⁵, CD4⁺ T lymphocyte% (31–60%); ⁶, CD8⁺ T lymphocyte% (13–41%); ⁷, CD4⁺ T lymphocyte%/CD8⁺ T lymphocyte% (0.7–2.87); ⁸, natural killer cell% (5.0–27.0%); ⁹, B Lymphocyte% (6.0–25.0%); ¹⁰, interleukin-4 (0–8.56 pg/mL); ¹¹, interleukin-6 (0–5.4 pg/mL); ¹², interleukin-10 (0–12.9 pg/mL); ¹³, interleukin-17 (0–21.4 pg/mL); ¹⁴, tumor necrosis factor-α (0–16.5 pg/mL); ¹⁵, interferon-γ (0–7.31 pg/mL); ¹⁶, C-reactive protein (0–11 mg/L); ¹⁷, procalcitonin (<0.046 ng/mL).