Demographic and behavioral characteristics associated with chikungunya virus infection among survey participants from four communities in Puerto Rico, November 2015–February 2016.
Background: Childhood cancer survivors treated before 1992, when blood donor screening for hepatitis C virus (HCV) infection was introduced, are at risk of transfusion-transmitted HCV infection
Unadjusted prevalence ratios (PR) and 95% confidence intervals (CI) for factors associated with COVID-19 positivityb'^' among homeless shelter workers (N = 77 participants who reported being tested).