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Background  Pediatric SARS-CoV-2 infection is generally thought to be asymptomatic or result in mild COVID-19 disease, with a paucity of severe outcomes. However, SARS-CoV-2 variants, notably B.1.617.2 (WHO Delta), have changed the clinical landscape of COVID-19 in the United States. Delta became the dominant variant in Arkansas (AR) the 1 st  week of July 2021. Schools contributed to pediatric infections during the January 2021 surge in COVID-19 infections even with physical mitigation measures (PMM) that were removed in March 2021. We present preliminary data suggesting a shift in the clinical presentation of children with Delta variant infection.Methods  Pediatric (ages ≤ 18 years) case records for the 3 months representing key inflection points of the COVID-19 Pandemic in AR were reviewed. Outcomes (hospitalizations, ICU admission, mechanical ventilation, death) were recorded by the Arkansas Department of Health (ADH) in a statewide database. Fisher’s Exact Test was used with p-values < 0.05 indicating statistical significance.    Results  During July 2020, 3,268 pediatric cases were reported to ADH with 55 hospitalizations, 6 ICU admissions, 2 mechanical ventilations, and no deaths. A second peak in January 2021 included 11,735 pediatric cases, a 259.1% increase. Increases were also seen in hospitalizations (n=74), ICU admissions (n= 11), and mechanical ventilations (n=2). No deaths reported. The beginning of an exponential growth in cases during July 2021, before the opening of schools, included 8,031 pediatric cases. Despite 31.6% fewer cases than the previous peak, hospitalizations increased 41.9% (n=105) (p < 0.0001) and included increases in ICU and ventilator use of 68.6% (n=18) (p 0.0016) and 300% (n=8) (p 0.0034), respectively. One pediatric death was reported. (Tbl 1)    Conclusion  In the absence of PMM and despite the summer closure of schools, pediatric COVID-19 cases and severe outcomes increased significantly. Initial analysis of the AR July 2021 Delta variant surge indicates a statistically significant increase in pediatric COVID-19 disease and severity as indicated by a proportional increase in hospitalizations, ICU, and ventilator use. Further studies are warranted to better define Delta related childhood disease. Our findings also have implications for school PMM efforts.    Disclosures    All Authors : No reported disclosures

LB10. Impact of SARS-CoV-2 Delta Variant on the Spectrum of Pediatric COVID-19 Disease in Arkansas