Table 2. Main characteristics of cases of West Nile virus infection, EU and EU enlargement countries, 2010–2018 (n = 3,849).

	2010	2011	2012	2013	2014	2015	2016	2017	2018	2010–2018
Demographics
Median age in years (IQR)	70 (53–77)	70 (50–77)	67 (54–76)	66 (51–78)	65 (53–74)	63 (49–74)	65 (53–75)	64 (51–76)	66 (52–76)	66 (52–76)
Female: age (IQR)	71 (58–78)	70 (48–77)	68 (53–77)	64 (49–79)	66 (53–75)	61 (45–69)	69 (54–77)	64 (51–76)	66 (50–77)	66 (51–77)
Male: age (IQR)	67 (50–76)	70 (52–75)	66 (54–75)	67 (53–77)	64 (52–74)	63 (51–76)	64 (52–74)	64 (50–77)	66 (54–76)	66 (53–76)
Male:female ratio	1.3	1.7	1.3	1.5	1.8	2.7	1.4	1.6	1.5	1.5
Clinical manifestation
% WNND	81	74	68	69	82	78	79	77	70	73
% WNF	19	25	32	30	18	12	12	16	26	24
% Asymptomatic cases	0.0	0.67	0.0	0.40	0.0	10.0	8.6	7.0	4.1	3.6
Classification
% Confirmed cases	50	66	52	73	81	86	89	77	86	78

EU: European Union; IQR: interquartile range; WNND: West Nile neuroinvasive disease.