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Table 1 Selected features of countries included in the study of age distribution of influenza cases. The Global Influenza B Study, 1999-2014

From: Distribution of influenza virus types by age using case-based global surveillance data from twenty-nine countries, 1999-2014

Country

Latitude (a)

Population (million)

Ageing index (b)

GDP per capita (USD)

% of outpatients (c)

No. influenza cases (seasons) included in the analysis:

A(H1N1)

A(H1N1)pdm2009

A(H3N2)

B

Southern hemisphere

 New Zealand

41.8 S

4.5

0.72

30,400

30%

2,274 (5)

3,763 (3)

4,840 (8)

2,763 (7)

 Chile

35.8 S

16.6

0.48

19,100

5%

403 (1)

5,399 (3)

3,540 (3)

897 (2)

 South Africa

29.0 S

53.0

0.22

11,500

0%

- (0)

432 (3)

421 (3)

527 (3)

 Australia

25.8 S

23.4

0.84

43,000

50%

3,614 (6)

50,096 (4)

13,286 (9)

28,673 (12)

Inter-tropical belt

 Madagascar

19.4 S

21.3

0.08

1,000

100%

109 (1)

1,101 (2)

579 (4)

1,004 (4)

 Brazil (d)

10.8 S

201.0

0.32

12,100

NA

- (0)

- (0)

- (0)

665 (4)

 Ecuador

2.0 S

15.4

0.24

10,600

0%

- (0)

673 (2)

713 (3)

185 (1)

 Indonesia

1.7 S

237.4

0.25

5,200

95%

720 (2)

- (0)

1,397 (4)

1,281 (4)

 Kenya

0.4 S

44.4

0.07

1,800

40%

365 (2)

1,285 (3)

1,183 (5)

1,454 (5)

 Singapore

1.2 N

5.4

0.63

62,400

100%

- (0)

2,634 (3)

1,436 (3)

1,483 (3)

 Cameroon

5.7 N

22.5

0.07

2,400

90%

- (0)

- (0)

259 (2)

102 (1)

 Ivory Coast

7.6 N

23.2

0.09

1,800

83%

- (0)

344 (2)

171 (1)

446 (2)

 Panama

8.6 N

3.7

0.28

16,500

39%

- (0)

744 (1)

321 (2)

154 (1)

 Costa Rica

10.0 N

4.6

0.30

12,900

27%

- (0)

4,069 (2)

1,026 (4)

387 (2)

 Nicaragua

12.9 N

6.1

0.16

4,500

43%

- (0)

3,113 (3)

1,089 (4)

699 (3)

 El Salvador

13.8 N

6.1

0.25

7,500

22%

- (0)

858 (2)

317 (2)

437 (3)

 Honduras

14.8 N

8.2

0.11

4,800

56%

- (0)

656 (2)

277 (2)

- (0)

 Guatemala

15.7 N

15.4

0.12

5,300

72%

263 (1)

1,681 (3)

169 (1)

316 (2)

 Viet Nam

16.7 N

89.7

0.23

4,000

40%

1,218 (2)

1,368 (3)

2,781 (6)

2,982 (8)

Northern hemisphere

 Bhutan

27.4 N

0.7

0.22

2,600

97%

- (0)

510 (2)

130 (1)

101 (1)

 China South (e)

31.1 N

969.4

0.56

9,800

100%

5,530 (5)

40,754 (2)

30,299 (7)

35,910 (8)

 Morocco

32.0 N

33.2

0.24

5,500

70%

- (0)

2,076 (2)

354 (2)

- (0)

 Turkey

39.0 N

76.7

0.26

15,300

100%

1,298 (2)

- (0)

- (0)

289 (1)

 Portugal

39.3 N

10.4

1.17

22,900

97%

- (0)

648 (3)

2,085 (8)

733 (4)

 China North (e)

39.5 N

370.9

0.56

9,800

100%

3,900 (5)

22,951 (3)

13,054 (7)

19,956 (7)

 Italy

42.9 N

59.9

1.52

29,600

60%

- (0)

3,880 (2)

1,900 (2)

493 (1)

 Kazakhstan

48.0 N

17.9

0.28

14,100

5%

- (0)

108 (1)

421 (3)

163 (1)

 Ukraine

49.1 N

44.6

1.14

7,400

NA

- (0)

104 (1)

- (0)

- (0)

 England (f)

52.3 N

53.0

0.91

37,300

57%

179 (1)

2,438 (3)

1,743 (6)

1,319 (3)

      

19,873 (33)

151,685 (60)

83,791 (102)

103,419 (93)

  1. NA: not available
  2. (a) Latitude of centroid (when available) or largest city
  3. (b)Defined as the number of people aged 65 years or older per hundred people aged 14 years or younger
  4. (c)Proportion of outpatients among reported influenza cases
  5. (d)Information on subtype of influenza A cases was not available for Brazil
  6. (e)Ageing index and GDP per capita of China (whole country)
  7. (f)Ageing index and GDP per capita of United Kingdom