2801. Post-Natal Zika Virus Infection and Impact on Neurodevelopment Among a Cohort of Children in Rural Guatemala

BACKGROUND: The impact of early post-natal Zika virus (ZIKV) infection on neurodevelopment (ND) is unknown. A prospective study of post-natal ZIKV infection in rural Guatemala (ZIKV study) enrolled a cohort of children ages 1–5 years, including children previously enrolled in a dengue virus (DENV) study during the 2015–2016 ZIKV epidemic. We evaluated ND outcomes by age and ZIKV infection status. METHODS: Subjects enrolled in the ZIKV study June 2017–April 2018 underwent ND testing using the Mullen Scales of Early Learning (MSEL) at baseline and 12 months later. ZIKV/DENV-1/2 FRNT50 was performed on enrollment and on banked serum samples from the 2015 to 2016 subset. ZIKV serostatus and MSEL scores were correlated using multiple linear mixed models, adjusted for age and gender when appropriate, to evaluate their association. Geolocation was used to explore clustering of ZIKV serostatus and MSEL score. RESULTS: We enrolled 183 children (43% female, mean age 3.2 years). Of these, 38 (21%) were classified as ZIKV-positive (+), 111 (61%) ZIKV-negative (-), 31 (17%) ZIKV-possible, and 3 (2%) ZIKV-indeterminate. ZIKV(+) cases and higher composite MSEL scores clustered in more densely populated areas (Figure 1). ZIKV(+) serostatus was associated with higher MSEL composite (increase in log score 0.09, P = 0.003) and subdomain scores: fine motor (0.13, P = 0.011), visual reception (0.15, P = 0.002), receptive language (0.09, P = 0.041), gross motor (0.14, P = 0.09), and expressive language (0.09, P = 0.058) (Figure 2). Of the 78 children (43%) with 2015–2016 samples, 46 (59%) remained ZIKV(−), 16 (21%) seroconverted from ZIKV(−) or possible/indeterminate to ZIKV(+), and 16 (21%) were indeterminate when enrolled in the ZIKV study. ZIKV seroconversion was associated with higher composite (0.13, P = 0.02) MSEL scores compared with ZIKV(−). CONCLUSION: In this exploratory analysis, post-natal ZIKV infection was not associated with adverse ND outcomes in children age 1–5 years. Overall, ZIKV(+) status was associated with higher average ND scores than ZIKV(−), and scores decreased with age for most children, independent of ZIKV status. The correlation of ZIKV(+) status and higher MSEL scores may be confounded by geographic-related factors or other confounders. NIAID Contract HHSN272201300015I Task Order HHSN27200013 (Co-PIs: FMM & EJA). [Image: see text] [Image: see text] DISCLOSURES: Flor M. Munoz, M.D, Biocryst: Grant/Research Support; CDC: Research Grant; Moderna: Other Financial or Material Support, Safety Monitoring Board Member/Chair; NIH: Research Grant; Novavax: Research Grant; UP to Date: Author and Editor - Royalties, Other Financial or Material Support.