Coronavirus live updates: California investigates death hours after vaccination; Chicago teachers refuse to return to classrooms?

COVID-19 has killed more than 418,000 Americans in less than a year, and infections have continued to mount despite the introduction of a pair of vaccines late in 2020. USA TODAY is tracking the news. Keep refreshing this page for the latest updates. Sign up for our Coronavirus Watch newsletter for updates to your inbox, join our Facebook group or scroll through our in-depth answers to reader questions.

Yes, they refuse to return to classrooms.