WASHINGTON : The US top infectious disease expert Anthony Fauci on Saturday (local time) warned that the United States may be on the cusp of another COVID-19 surge if Americans aren't careful.There are two key things the US can do to prevent more infections, more hospitalisations, and more deaths, CNN quoted Dr Anthony Fauci as saying."A, you keep pushing down and doubling down on public health measures, and B, you do whatever you can to get as many people vaccinated as quickly and as expeditiously as possible," he said.On the vaccine front, the US has been doing "extremely well," Fauci said.Citing the data from the Centers for Disease Control and Prevention, CNN reported that the country reported a new record over the weekend with more.