Table 1.

Characteristics of Powassan virus disease cases reported to ArboNET, United States, 2006–2016

Characteristic		(N=99) No. (%)
Age group (years)
	0–9	8 (8)
	10–19	3 (3)
	20–29	3 (3)
	30–39	6 (6)
	40–49	7 (7)
	50–59	13 (13)
	60–69	29 (29)
	70–79	22 (22)
	≥80	8 (8)
Male		72 (73)
Clinical syndrome
Neuroinvasive		89 (90)
	Encephalitis	71 (72)
	Meningitis	16 (16)
	Other neurologic*	2 (2)
Non-neuroinvasive		10 (10)
	Febrile illness	10 (10)
Hospitalized		89 (90)
Death		11 (11)

^*Presentation for one patient was with ataxia, fever, rash, fatigue, and myalgia, and for one patient was headache, tremors, hemiparesis, and altered mental status