COVID-19 Pandemic Marks Four Years

New Subvariants Drive Increase in Cases

Concise News Lead

More than a third of COVID-19 cases in the US are now estimated to be from new subvariants, dubbed "FLiRT." These subvariants have contributed to a rise in cases in 39 states, with an increase of 4724 cases reported in the past week compared to April's figures.