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Table 1 Comparison of pathogens in preterm and term infants

From: Clinical characteristics of hospitalized term and preterm infants with community-acquired viral pneumonia

Clinical Parameters

Term infants n = 344

Preterm infants n = 31

P value

Demographic data

  Sex (male, %)

224(65.1)

24(77.4)

0.166

  Age at admission (median, IQR, days)

19.0(13.3–24.0)

28(26–40)

 < 0.001

  PMA (mean ± std, weeks)

41.7 ± 1.5

37.8 ± 2.3

 < 0.001

Virus type

  RSV (n, %)

308(89.5)

16(51.6)

 < 0.001

  PIV3(n, %)

24(7.0)

11(35.5)

 < 0.001

  Other viruses (n, %)

12(3.5)

3(9.7)

0.228

  RSV and PIV3 coinfection (n, %)

1(0.3)

0(0.0)

0.999

Co-infection distribution

  Co-infection with bacteria (total, n, %)

117(34.0)

23(74.2)

 < 0.001

  Gram positive bacteria (n, %)

56(16.3)

6(19.4)

0.659

  Staphylococcus aureus (n, %)

39(11.3)

3(9.7)

0.999

  Streptococcus viridans (n, %)

17(4.9)

3(9.7)

0.480

  Gram negative bacteria (n, %)

61(17.7)

17(54.8)

 < 0.001

  Escherichia coli (n, %)

26(7.6)

6(19.4)

0.055

  Klebsiella pneumoniae (n, %)

14(4.1)

8(25.8)

 < 0.001

  Moraxella catarrhalis (n, %)

12(3.5)

1(3.2)

0.999

  Aerobacter cloacae (n, %)

5(1.5)

0(0)

0.999

  Enterobacter aerogenes (n, %)

2(0.6)

1(3.2)

0.596

  Haemophilus influenzae (n, %)

2(0.6)

0(0)

0.999

  Proteus mirabilis (n, %)

0(0)

1(3.2)

0.129

  Mycoplasma (n, %)

2(0.6)

1

0.596

  1. PMA postmenstrual age, RSV respiratory syncytial virus, PIV parainfluenza virus