Table 1 Demographic and clinical data of children with MPP

Age (mean ± SD, year)

5.5 ± 2.4

Male (n, %)

19 (54.3)

Duration of fever, (25th–75th percentile, d)

15 (13–18)

Length of stay, (25th–75th percentile, d)

10 (7–13)

White blood cell counts (mean ± SD, ×10⁹/L)

9.6 ± 4.596

Neutrophils proportion (mean ± SD, %)

70.1 ± 13.8

C-reactive protein (25th–75th percentile, mg/L)

25.4 (10.0–62.2)

ALT increase (n, %)

8 (22.9)

LDH (mean ± SD, U/L)

499.0 ± 171.8

CKMB (25th–75th percentile, U/L)

17.5 (15–24.4)

IgG (mean ± SD, g/L)

9.8 ± 4.2

IgA (25th–75th percentile, g/L)

1.4 ± 0.9

IgM (mean ± SD, g/L)

2.3 ± 1.2

CD3 + T cells (mean ± SD, %)

67.1 ± 10.9

CD3 + CD4+ T cells (mean ± SD, %)

36.6 ± 9.7

CD3-CD8+ T cells (mean ± SD, %)

26.2 ± 6.1

CD3-CD19+ B cells (mean ± SD, %)

19.2 ± 8.1

CD3-CD (16 + 56+) NK cells (mean ± SD, %)

12.0 ± 8.1

CD19 + CD23+ B cells (mean ± SD, %)

8.9 ± 4.7

Cytology of BALF

 Neutrophils (%)

65.6

 Lymphocytes (%)

7.2

 Phagocytes (%)

26.4

Radiologic evaluation (n, %)

 Lobar or segmental opacity

33 (94.3)

 Opacity with pleural effusion

12 (34.3)

 Opacity with pulmonary atelectasis

3 (8.6)

Macrolide medication (n, %)

35 (100)

Methylprednisolone (n, %)

35 (100)