A new study indicates that coronavirus variants are not more resistant to vaccines and previous infection, a finding that should help allay one of the major worries about the course of the pandemic.

Researchers from the La Jolla Institute for Immunology and the University of California San Diego examined the response of T-cells in the blood samples of 11 people who had previously been infected with COVID-19 and 19 people who had been vaccinated. They tested them against variants from the United Kingdom, South Africa, Brazil, and California.