Table 3 Incidence of virus-associated acute lower respiratory infections in children aged 2–23 months from February to December 2015 in the Basse HDSS, rural Gambia; (mid-point population at risk: 2–11 mo = 5038, 12–23 mo = 6254).

From: Respiratory syncytial, parainfluenza and influenza virus infection in young children with acute lower respiratory infection in rural Gambia

Age 2–11 mo

Observed number of cases

Expected number of cases (95% CI)

Expected incidence per 1000 population per year (95% CI)

Any virus

196

991 (913, 1066)

197 (181, 212)

RSV-A

165

847 (765, 927)

168 (152, 184)

RSV-B

3

14 (0, 35)

3 (0, 7)

Influenza-A

9

51 (21, 85)

10 (4, 17)

Influenza-B

6

31 (8, 59)

6 (2, 12)

PIV-1

1

6 (0, 20)

1 (0, 4)

PIV-3

10

47 (19, 81)

9 (4, 16)

PIV-4

10

35 (12, 62)

7 (2, 12)

Age 12–23 mo

Any virus

107

561 (494, 626)

90 (79, 100)

RSV-A

72

389 (321, 457)

62 (51, 73)

RSV-B

4

22 (3, 47)

4 (0.5, 8)

Influenza-A

10

54 (23, 91)

9 (4, 15)

Influenza-B

14

74 (37, 115)

12 (6, 18)

PIV-1

0

  

PIV-3

6

28 (7, 55)

4 (1, 9)

PIV-4

6

33 (8, 64)

5 (1, 10)

Age 2–23 mo

Any virus

303

1543 (1439, 1644)

140 (131, 149)

RSV-A

237

1232 (1124, 1339)

112 (102, 122)

RSV-B

7

34 (10, 65)

3 (1, 6)

Influenza-A

19

97 (55, 144)

9 (5, 13)

Influenza-B

20

104 (60, 154)

9 (5, 14)

PIV-1

1

5 (0, 18)

0.5 (0, 2)

PIV-3

16

77 (40, 120)

7 (4, 11)

PIV-4

16

67 (33, 107)

6 (3, 10)

  1. Note: Values for the expected and 95% confidence limits for the number of cases in the population took into account the monthly sampling scheme, being generated by simulation using the number of observed cases each month, the number of patients tested each month and the proportion of all patients tested each month (see Methods and Supplementary Tables 11–13 and Supplementary Material p 19). Expected numbers of cases by simulation in age strata may not sum to the expected number of cases overall.
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