The United States will most likely experience a \u0022post-seasonal\u0022 spike in coronavirus infections largely due to holiday travel and gatherings, current and former U.S. health officials said on Sunday.\u0022I share the concern of President-elect Biden that, as we get into the next few weeks, it might actually get worse.\u0022—Dr. Anthony Fauci\u0022We very well might see a post-seasonal—in the sense of Christmas, New Year\u0026#039;s—surge... a surge upon a surge,\u0022 said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases and an incoming chief medical adviser to President-elect Joe Biden, on CNN\u0026#039;s \u0022State of the Union.\u0022\u0022We\u0026#039;re really at a very critical point,\u0022 he warned.\u0026nbsp;\u0022I share the concern of President-elect Biden that, as we get into the next few weeks, it might actually get worse,\u0022 Fauci added, referring to Biden\u0026#039;s\u0026nbsp;prediction\u0026nbsp;earlier this week that \u0022our darkest days in the battle against Covid-19 are ahead of us, not behind us.\u0022Dr. Anthony Fauci says he believes the worst is still yet to come in the coronavirus pandemic following the holiday season. “I share the concern of President-elect Biden that as we get into the next few weeks, it might actually get worse.” #CNNSOTU https://t.co/KsKyKgNAG6 pic.twitter.com/xwSdyNyyuG— State of the Union (@CNNSotu) December 27, 2020U.S. Surgeon General Jerome Adams also said that a post-holiday infection surge was likely.\u0026nbsp;\u0022But what the important thing for people to understand is that even if you traveled, it doesn\u0026#039;t mean you just throw your hands up in the air and say, oh well,\u0022 he\u0026nbsp;said\u0026nbsp;on\u0026nbsp;ABC\u0026#039;s \u0022This Week.\u0022\u0022There are measures that you can take,\u0022 said Adams, including getting tested, self-quarantining, and avoiding vulnerable people such as the elderly and those with pre-existing conditions.\u0026nbsp;Former U.S. Food and Drug Administration Commissioner Scott Gottlieb, appearing on CBS\u0026nbsp;\u0022Face the Nation,\u0022\u0026nbsp;predicted \u0022a grim month.\u0022\u0026nbsp;\u0022We have a very difficult month ahead of us,\u0022 he said, identifying California, Massachusetts, New York, and New Jersey as places \u0022where cases are still building.\u0022When asked how long it will be until the nation sees results from the two vaccines which have been administered to some 1.9 million Americans and counting, Gottlieb said that while vaccinations are \u0022going to take about three weeks to get through all the nursing homes,\u0022 there will be \u0022some indication\u0022 that mass inoculation is \u0022probably having an effect maybe as early as this week.\u0022\u0026nbsp;More than 4.4 million Covid vaccines have been provided across the world (that we know of). That includes, in doses: 1.9 million in the U.S.1 million in China600,000+ in the UKHere\u0026#039;s a breakdown from @BBGVisualData https://t.co/tGqjSA83Hp pic.twitter.com/JSAX4V8BPc— Kristine Servando (@tinssoldier) December 28, 2020Fauci told CNN that in order to achieve \u0022herd immunity\u0022—the effective neutralization of the virus following the infection or vaccination of enough people—70% to 85% of the public would likely need to be inoculated.\u0026nbsp;The U.S. Centers for Disease Control and Prevention reported 179,104 new coronavirus infections and 1,309 new daily deaths on Sunday, for a total of 18.9 million U.S. infections and 330,901 Covid-19 deaths during the nine-month pandemic.\u0026nbsp;The health experts\u0026#039; warnings came the morning after Trump refused to sign a $900 billion pandemic relief bill, allowing unemployment coverage for millions of Americans to expire and threatening millions more with eviction as a federal moratorium was set to expire at the end of the year.Trump acquiesced to bipartisan pressure and later on Sunday signed a $2.3 trillion Covid-19 relief and spending bill that will provide vaccine distribution, unemployment, small business, and airline company assistance, and fund the U.S. government through September 2021.