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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