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Table 4 Throat swab specimens collected from ILI and SARI sites and from outbreak areas and influenza positivity rate by month from 2009 to 2015, Ethiopia

From: Epidemiology of influenza in Ethiopia: findings from influenza sentinel surveillance and respiratory infection outbreak investigations, 2009–2015

Characteristic

 

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Total

Samples collected

N

252

258

382

297

274

273

357

294

320

580

509

485

4281

%

5.9

6.0

8.9

6.9

6.4

6.4

8.3

6.9

7.5

13.5

11.9

11.3

100.0

Samples Tested

N

251

247

381

291

273

269

351

286

317

579

506

484

4235

%

5.9

5.8

9.0

6.9

6.4

6.4

8.3

6.8

7.5

13.7

11.9

11.4

100.0

Influenza Positive samples

N

61

50

105

66

25

25

32

22

48

141

190

128

893

%

6.8

5.6

11.8

7.4

2.8

2.8

3.6

2.5

5.4

15.8

21.3

14.3

100.0

Pos. %

24.3

20.2

27.6

22.7

9.2

9.3

9.1

7.7

15.1

24.4

37.5

26.4

21.1

Influenza A

N

25

15

38

34

15

10

18

15

37

125

164

94

590

%

4.2

2.5

6.4

5.8

2.5

1.7

3.1

2.5

6.3

21.2

27.8

15.9

100.0

A(H1N1) pdm2009

N

11

5

13

14

8

5

10

5

12

60

73

49

265

%

4.2

1.9

4.9

5.3

3.0

1.9

3.8

1.9

4.5

22.6

27.5

18.5

100.0

A(H3N2)

N

14

10

25

20

7

5

8

10

25

65

91

45

325

%

4.3

3.1

7.7

6.2

2.2

1.5

2.5

3.1

7.7

20.0

28.0

13.8

100.0

Influenza B

N

36

35

67

32

10

15

14

7

11

16

26

34

303

%

11.9

11.6

22.1

10.6

3.3

5.0

4.6

2.3

3.6

5.3

8.6

11.2

100.0