Table 1.

Subject demographics and sample characteristics.

	Subjects		Samples
	Age (years∗)	Male (%)/female (%)	Acute (days of onset∗)	Convalescent (days of onset∗)	A-C interval (days∗)
Primary (n = 16)	26 ± 9, (7–42)	13 (81)/3 (19)	2.5 ± 1.7, (1–7)	18.5 ± 5.9, (9–32)	15.9 ± 5.6, (7–30)
Secondary (n = 73)	36 ± 8, (9–53)	47(64)/26 (36)	2.1 ± 1.3, (1–7)	15.3 ± 4.4, (6–28)	13.2 ± 3.9, (4–26)
Total (n = 89)	34 ± 9, (7–53)	60 (67)/29 (33)	2.2 ± 1.4, (1–7)	15.9 ± 4.8, (6–32)	13.7 ± 4.4, (4–30)

^∗Mean ± SD (range).