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Volume 23, Number 5—May 2017

Dispatch

Estimated Incubation Period for Zika Virus Disease

Elisabeth R. Krow-Lucal, Brad J. Biggerstaff, and J. Erin StaplesComments to Author 
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (E.R. Krow-Lucal); Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (E.R. Krow-Lucal, B.J. Biggerstaff, J.E. Staples)

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Table

Demographics, travel data, and laboratory testing results for Zika virus disease patients, United States, January 1, 2015, through June 23, 2016

Patient characteristic All cases, no. (%), n = 197* Confirmed cases, no. (%), n = 79†
Age, y
0–19 19 (10) 10 (13)
20–39 71 (36) 29 (37)
40–59 79 (40) 32 (40)
>60 27 (14) 7 (9)
Unknown
1 (<1)
1 (1)
Sex
M 77 (39) 26 (33)
F 119 (60) 52 (66)
Unknown
1 (1)
1 (1)
Pregnant
Yes 11 (6) 2 (3)
No 161 (82) 60 (76)
Unknown
25 (13)
17 (22)
Travel duration, d
<7 24 (12) 15 (19)
7–13 88 (45) 64 (81)
14–20 31 (16) 0
21–27 12 (6) 0
≥28 42 (21) 0

*Persons with Zika virus–like symptoms and positive results for Zika virus RNA by real-time reverse transcription PCR or positive results for Zika or dengue virus IgM and Zika virus plaque reduction neutralization test (PRNT) results >10 and Zika virus titer >4-fold higher than dengue virus titer.
†Persons who traveled <2 weeks, experienced Zika virus–like symptoms, and had positive Zika virus RNA results by real-time reverse transcription PCR or positive Zika or dengue virus IgM results and PRNT >10 and dengue PRNT <10.

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