2806. Follow-up of Children with Confirmed Perinatal Zika Virus Exposure: The First 2-year experience in the Costa Rican Tertiary Pediatric Hospital

BACKGROUND: Costa Rica (CR) has local transmission of Zika Virus (ZIKV) Infection since February 2016. Perinatal exposure (PE) and infection (PI) cases have been documented. Following a national protocol, reporting and follow-up of patients is mandatory. 2018 data of CR reported 272 women with confirmed ZIKV infection during pregnancy. Even though neurological sequelae are described in PI, including microcephaly, affected patients can develop symptoms within months after birth with development, language, and behavior alterations. METHODS: Retrospective descriptive study of patients born from August 1, 2016 until July 31, 2018, with laboratory confirmed PE. Follow-up was performed at referral hospital. RESULTS: 101 patients were enrolled (37% of all national confirmed perinatal ZIKV exposure during study period). Median age of first evaluation was 5 months (range: 0.6–21). 86/101 (86%) were classified as adequate term infants. 34/101 (33.7%) mothers got infected at first trimester, 55 (54.4%) at second, and 11 (10.8%) at third trimester. No data available in one. 8/101 (8%) patients had microcephaly at birth, with only 3/101 (3%) with persistence at follow-up, and 3/101 (3%) developed it later (after 9 months). 3/101 (3%) had confirmed congenital ZIKV syndrome (laboratory confirmation in symptomatic children), and 2 (2%) congenital ZIKV infection (laboratory confirmation in asymptomatic child). 6/101 (6%) had tone abnormalities and global development delay. 9 (9%) had central nervous system (CNS) ultrasound abnormalities, and 3 (3%) developed seizures. 2 (2%) had visual abnormalities, 1 (1%) had hearing impairment, 4 (4%) developed eating abnormalities, 6 (6%) developed language delay, and 4 (4%) had hyperactive behavior. All findings were divided according to maternal trimester of infection. CONCLUSION: PI is a health problem in CR. Microcephaly at is infrequent, with international data showing it affects less than 1% of newborns. Most motor and development delay were documented in patients infected early during pregnancy, but specific language and behavior abnormalities also affected patients with later PE. Mortality was not documented, but significant CNS abnormalities were evident in congenital ZIKV syndrome patients. DISCLOSURES: All authors: No reported disclosures.