• Gabriela Paz-Bailey, Eli S Rosenberg, Kate Doyle, Jorge Munoz-Jordan, Gilberto A Santiago, Liore Klein, Janice Perez-Padilla, Freddy A Medina, Stephen H Waterman, Carlos Garcia Gubern, Luisa I Alvarado, and Tyler M Sharp.
• From the National Center for HIV/AIDS, Viral Hepatitis, Sexually Transmitted Diseases, and Tuberculosis Prevention, Centers for Disease Control and Prevention (G.P.-B., K.D.), and the Department of Epidemiology, Emory University (E.S.R.), Atlanta; and the National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention (J.M.-J., G.A.S., J.P.-P., F.A.M., S.H.W., T.M.S.), and Caduceus Healthcare (L.K.), San Juan, and Ponce University School of Medicine-Saint Luke's Episcopal Hospital Consortium, Ponce (C.G.G., L.I.A.) - all in Puerto Rico.
• N. Engl. J. Med. 2018 Sep 27; 379 (13): 1234-1243.

BackgroundTo estimate the frequency and duration of detectable Zika virus (ZIKV) RNA in human body fluids, we prospectively assessed a cohort of newly infected participants in Puerto Rico.MethodsWe evaluated samples obtained from 150 participants (including 55 men) in whom ZIKV RNA was detected on reverse-transcriptase-polymerase-chain-reaction (RT-PCR) assay in urine or blood in an enhanced arboviral clinical surveillance site. We collected serum, urine, saliva, semen, and vaginal secretions weekly for the first month and then at 2, 4, and 6 months. All specimens were tested by means of RT-PCR, and serum was tested with the use of anti-ZIKV IgM enzyme-linked immunosorbent assay. Among the participants with ZIKV RNA in any specimen at week 4, biweekly collection continued until all specimens tested negative. We used parametric Weibull regression models to estimate the time until the loss of ZIKV RNA detection in each body fluid and reported the findings in medians and 95th percentiles.ResultsThe medians and 95th percentiles for the time until the loss of ZIKV RNA detection were 14 days (95% confidence interval [CI], 11 to 17) and 54 days (95% CI, 43 to 64), respectively, in serum; 8 days (95% CI, 6 to 10) and 39 days (95% CI, 31 to 47) in urine; and 34 days (95% CI, 28 to 41) and 81 days (95% CI, 64 to 98) in semen. Few participants had detectable ZIKV RNA in saliva or vaginal secretions.ConclusionsThe prolonged time until ZIKV RNA clearance in serum in this study may have implications for the diagnosis and prevention of ZIKV infection. Current sexual-prevention guidelines recommend that men use condoms or abstain from sex for 6 months after ZIKV exposure; in 95% of the men in this study, ZIKV RNA was cleared from semen after about 3 months. (Funded by the Centers for Disease Control and Prevention.).

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