Epidemiologic analysis of chilblains cohorts before and during the COVID-19 pandemic

PE McCleskey, B Zimmerman, A Lieberman… - JAMA …, 2021 - jamanetwork.com
Importance Beginning in March 2020, case reports and case series linked the COVID-19
pandemic with an increased occurrence of chilblains, but this association has not been
evaluated in an epidemiologic study. Objective To assess whether a correlation exists
between COVID-19 incidence and chilblains incidence. Design, Setting, and Participants A
retrospective cohort study was conducted within the Kaiser Permanente Northern California
system from January 1, 2016, to December 31, 2020; health plan members of all ages were …