Search

OBJECTIVES Throughout the COVID-19 pandemic, masking has been a widely used mitigation practice in kindergarten through 12th grade (K–12) school districts to limit within-school transmission. Prior studies attempting to quantify the impact of masking have assessed total cases within schools; however, the metric that more optimally defines effectiveness of mitigation practices is within-school transmission, or secondary cases. We estimated the impact of various masking practices on secondary transmission in a cohort of K–12 schools. METHODS We performed a multistate, prospective, observational, open cohort study from July 26, 2021 to December 13, 2021. Districts reported mitigation practices and weekly infection data. Districts that were able to perform contact tracing and adjudicate primary and secondary infections were eligible for inclusion. To estimate the impact of masking on secondary transmission, we used a quasi-Poisson regression model. RESULTS A total of 1 112 899 students and 157 069 staff attended 61 K–12 districts across 9 states that met inclusion criteria. The districts reported 40 601 primary and 3085 secondary infections. Six districts had optional masking policies, 9 had partial masking policies, and 46 had universal masking. In unadjusted analysis, districts that optionally masked throughout the study period had 3.6 times the rate of secondary transmission as universally masked districts; and for every 100 community-acquired cases, universally masked districts had 7.3 predicted secondary infections, whereas optionally masked districts had 26.4. CONCLUSIONS Secondary transmission across the cohort was modest (

For decades, physicians have administered corticosteroids in the perioperative period to infants undergoing heart surgery with cardiopulmonary bypass (CPB) to reduce the post-operative systemic inflammatory response to CPB. Some question this practice because steroid efficacy has not been conclusively demonstrated and because some studies indicate that steroids could have harmful effects. STRESS is a randomized, placebo-controlled, double blind, multi-center trial designed to evaluate safety and efficacy of perioperative steroids in infants (age < 1 year) undergoing heart surgery with CPB. Participants (planned enrollment = 1200) are randomized 1:1 to methylprednisolone (30mg/kg) administered into the CPB pump prime versus placebo. The trial is nested within the existing infrastructure of the Society of Thoracic Surgeons Congenital Heart Surgery Database (STS-CHSD). The primary outcome is a global rank score of mortality, major morbidities and hospital length of stay with components ranked commensurate with their clinical severity. Secondary outcomes include several measures of major post-operative morbidity, post-operative hospital length of stay and steroid-related safety outcomes including prevalence of hyperglycemia and post-operative infectious complications. STRESS will be one of the largest trials ever conducted in children with heart disease and will answer a decades old question related to safety and efficacy of perioperative steroids in infants undergoing heart surgery with CPB. The pragmatic “trial within a registry” design may provide a mechanism for conducting low cost, high efficiency trials in a heretofore-understudied patient population. Trial Registration Number