Table 2. Annual number of dengue cases estimated from mandatory notification and laboratory network surveillance systems by using Chao estimator, stratified according to geographic area and period of the year, metropolitan France, 2007–2010*.

	No. observed cases				Chao estimator
	System
Year, region, period	MN	LN	Common cases		Estimated no. cases (95% CI)	Completeness of MN, % (95% CI)		Completeness of LN, % (95% CI)
2007
Southeast, May–Nov	4	21	4		39 (26–87)		10.2 (2.4–17.2)	53.8 (12.6–90.4)
Other areas, remainder of year	52	365	21		2,070 (1,444–3,071)		2.5 (1.6–3.9)	17.6 (10.9–27.1)
Total	56	386	25		2,109 (1,481–3,109)		2.7 (1.6–4.0)	18.3 (11.3–27.5)
2008
Southeast, May–Nov	6	11	4		18 (14–37)		33.2 (7.6–44.8)	60.9 (13.9–82.2)
Other areas, remainder of year	58	293	42		733 (595–938)		7.9 (5.9–10.0)	40.0 (30.0–50.6)
Total	64	304	46		751 (613–956)		8.5 (6.3–10.6)	40.5 (29.8–50.5)
2009
Southeast, May–Nov	5	19	4		36 (24–79)		13.9 (3.1–22.9)	52.8 (11.6–87.2)
Other areas, remainder of year	63	331	38		1,021 (806–1,339)		6.2 (4.5–8.1)	32.4 (23.7–42.4)
Total	68	350	42		1,057 (841–1,375)		6.4 (4.6–8.2)	33.1 (23.6–42.4)
2010
Southeast, May–Nov	91	174	75		234 (216–264)		38.9 (33.2–42.7)	74.3 (63.6–81.6)
Other areas, remainder of year	494	1,951	354		4,222 (3,932–4,558)		11.7 (10.8–12.6)	46.2 (42.7–49.7)
Total	585	2,125	429		4,456 (4,164–4,792)		13.1 (12.2–14.1)	47.7 (44.2–51.1)
2007–2010
Southeast, May–Nov	106	225	87		327 (294–382)		32.4 (17.2–35.7)	68.8 (36.5–75.8)
Other areas, remainder of year	667	2,940	455		8,047 (7,217–9,045)		8.3 (7.1–9.2)	36.5 (31.1–40.7)
Total	773	3,165	542		8,374 (7,543–9,371)		9.2 (8.2–10.7)	37.8 (33.5–43.8)

*Information on geographic area or period of the year was not available for 27 cases. MN, mandatory notification; LN, laboratory network.