Table 3 Comparison of seasonal distribution of respiratory virus infection among hospitalized children with ARIs between 2018–2019 and 2020–2022

Winter in 2018–2019 year(12 m ~ 2 m)

1343

8(0.60)

334(24.87)

41(3.05)

16(1.19)

3(0.22)

1(0.07)

12(0.89)

415(30.90)

Winter in 2020–2022 year(12 m ~ 2 m)

1501

6(0.40)

415(27.65)

27(1.80)

7(0.47)

5(0.33)

1(0.07)

38(2.53)

499(33.24)

χ²

0.556

2.821

4.776

4.645

0.304

0.006

11.012

1.785

P

0.456

0.093

0.029

0.031

0.581

0.937

0.001

0.182

Time

Total number of cases

Percentage of virus-positive specimens [n(%)]

Total positive cases

ADV

RSV

Flu A

Flu B

PIV-1

PIV-2

PIV-3

Spring in 2018–2019 year(3 m ~ 5 m)

1254

4(0.32)

62(4.94)

7(0.56)

14(1.12)

14(1.12)

2(0.16)

59(4.70)

162(12.92)

Spring in 2020–2022 year(3 m ~ 5 m)

997

3(0.30)

49(4.91)

0(0.00)

5(0.50)

2(0.20)

1(0.10)

4(0.40)

64(6.42)

χ²

0.006

0.001

5.583

2.509

6.601

0.146

37.816

25.977

P

0.939

0.974

0.018

0.113

0.010

0.702

0.000

0.000

Time

Total number of cases

Percentage of virus-positive specimens [n(%)]

Total positive cases

ADV

RSV

Flu A

Flu B

PIV-1

PIV-2

PIV-3

Summer in 2018–2019 year (6 m ~ 8 m)

1163

18(1.55)

9(0.77)

1(0.09)

3(0.26)

7(0.60)

6(0.52)

67(5.76)

111(9.54)

Summer in 2020–2022 year(6 m ~ 8 m)

998

3(0.30)

18(1.80)

26(2.61)

2(0.20)

5(0.50)

1(0.10)

3(0.30)

58(5.81)

X²

8.681

4.616

27.627

0.077

0.099

2.875

51.092

10.381

P

0.003

0.032

0.000

0.781

0.753

0.090

0.000

0.001

Time

Total number of cases

Percentage of virus-positive specimens [n(%)]

Total positive cases

ADV

RSV

Flu A

Flu B

PIV-1

PIV-2

PIV-3

Autumn in 2018–2019 year(9 m ~ 11 m)

1261

6(0.48)

66(5.23)

7(0.56)

2(0.16)

9(0.71)

22(1.74)

21(1.67)

133(10.55)

Autumn in 2020–2022 year(9 m ~ 11 m)

1265

2(0.16)

139(10.99)

1(0.08)

0(0.00)

10(0.79)

2(0.16)

38(3.00)

192(15.18)

X²

2.019

28.040

4.533

2.008

0.050

16.891

4.960

12.079

P

0.155

0.000

0.033

0.156

0.823

0.000

0.026

0.001