More than 17% of U.S. adults reported having ever experienced symptoms of long COVID as of February, according to the Household Pulse Survey. Much has changed since the World Health Organization first called COVID-19 a pandemic four years ago today. As the U.S. enters its fifth year with the coronavirus, vaccines are available and have been updated to more closely match the spreading variants. Treatments and tests for the coronavirus are accessible. The U.S. government relaxed its coronavirus guidance and officially ended its national emergency declarations in perhaps the largest symbolic step away from the pandemic.