Dr. Anthony Fauci said Thursday he's concerned about a possible fourth surge in COVID-19 cases as numbers tick up in some states and Europe, which the U.S. has traditionally trailed by about four weeks in its COVID trajectory Fauci, the nation's chief disease expert, and other Biden administration officials testified before the Senate's Health committee on Thursday about the COVID response, stressing the U.S. is in a race against virus variants to vaccinate Americans as quickly as possible. Fauci said the situation in the U.S. has improved greatly since the intense spike in cases after the winter holidays, but that...