Table 3. Estimating Costs of Illness for Pandemic Influenza A (H1N1) 2009 and Seasonal Influenza in the Republic of Korea, 2007–2010.

	2007–2008 Season		2008–2009 Season		2009–2010 Season
Category	Cost (million US$)	% total costs	Cost (million US$)	% total costs	Cost (million US$)	% total costs
Direct costs
Direct medical costs
Medical costs of inpatients	2.74	6.16	3.80	8.90	77.00	4.79
Medical costs of outpatients	4.43	9.95	4.10	9.61	214.61	13.37
Stockpile antivirals	NA	NA	NA	NA	41.46	2.58
Direct non-medical costs
Transport costs of inpatients	0.12 (0.11–0.14)	0.28	0.17(0.15–0.19)	0.39	2.35 (2.04–2.65)	0.15
Transport costs of outpatients	6.91 (5.98–7.84)	15.53	6.23 (5.50–7.01)	14.61	71.16 (61.77–80.78)	4.43
Indirect costs (Productivity losses)
Productivity losses due to morbidity of inpatient	0.60	1.35	0.62	1.46	9.93	0.62
Productivity losses due to morbidity of outpatient	20.10(8.99–32.58)	45.16	18.31(7.86–28.98)	42.92	390.23 (281.16–499.30)	24.30
Productivity losses of caregiver	9.54(4.38–14.42)	21.43	9.32(4.22–14.52)	21.84	480.00(347.75–612.25)	29.89
Productivity losses due to premature mortality	0.07	0.15	0.11	0.26	19.16	1.19
Prevention strategy
Execution of the budget	NA	NA	NA	NA	259.26	16.15
Protective equipment	NA	NA	NA	NA	40.60 (14.50–68.85)	2.53
Total socioeconomic costs	44.65 (32.35–57.87)	100.00	42.31 (31.50–53.75)	100.00	1,581.27 (1435.96–1808.33)	100.00

NA: not available Costs are expressed as fixed value or median value (range, 10%–90%).