Risk-based strategies and analytics-based phone outreach could help target marginalized and high-risk populations for COVID-19 vaccination, preventing infections and poor outcomes, two new studies suggest.Risk-based strategies outperform othersIn the first study, published today in JAMA Health Forum, Kaiser Permanente researchers used a decision analytical model to simulate the effects of random, Centers for Disease Control and Prevention (CDC), age-based, and combination risk strategies of vaccine allocation on related hospitalizations, deaths, and household transmission among Kaiser health plan members in Oakland, California, from May 1 to Dec 31, 2020.During the 250 simulations, they also evaluated vaccine distribution by race and