Table 2.

Proportion of influenza-associated ILI in the selected sentinel sites, 4S Network Senegal, January 2013–December 2015 (95% CI)

Parameters	January–December 2013	January–December 2014	January–December 2015
(a) Total no of cases of ILI positive for all human influenza viruses	345	230	447
(b) Total no of ILI cases with clinical specimens collected	1136	1543	1353
(c) Proportion of influenza-associated ILI cases (%)	30.37	14.91	33.04
(d) Total no. of ILI outpatient visits	4057	2568	4371
(e) Estimated total no. of influenza-associated ILI cases	1232	383	1444
(f) Total number of all outpatient visits at selected sentinel sites	102 459	121 281	130 806
(g) Proportion of influenza-associated ILI to outpatient load at Selected sentinel site per 100 person-year (%) (95% CI)	1.2 (1.1–1.3)	0.32 (0.28–0.35)	1.11 (1.05–1.16)

(c): Proportion of influenza-associated ILI cases (%) was estimated from total number of cases of ILI positive for human influenza viruses reported to the total number of ILI cases from whom clinical specimens were collected for laboratory confirmation of influenza virus (%) (c) = [(a)/(b)) × 100]; (d): Include ILI outpatient visits from all selected sentinel sites (cases tested or not tested for influenza). (e): Estimated by multiplying the number of outpatient visits for ILI at selected sites by the proportion testing positive for influenza virus; (e) = (c) × (d); (g): was estimated by the proportion of the total number of influenza-associated ILI visits for each study year among all outpatient visits in the same year (%) (g) = [(e)/(f)) × 100].