Health Affairs published research led by Dr. Arturo Vargas Bustamante, UCLA Fielding School of Public Health professor of health policy and management, and doctoral student Joseph Nwadiuko, that found no statistically significant relationship between border entries by visa-holders issued through the Department of Labor’s seasonal guest worker program and COVID-19 rates in 2020-21, and little relationship between crossings by non-visa and COVID-19 rates.