The U.S. Centers for Disease Control and Prevention is not recommending travel at this time due to the rising number of COVID-19 cases in the country, which is due in part to the presence of more highly transmissible variants.There is now a race to administer as many vaccines as quickly as possible in order to stop a fourth surge in coronavirus cases.On Saturday, the United States hit a record by administering 4 million COVID-19 vaccine doses in a single day.In addition, nearly one in four American adults are fully vaccinated against the coronavirus. We are vaccinating at a rate of 3 million people on average every day, said CDC Director Dr. Rochelle Walensky.Still, some infectious disease experts are skeptical about those figures and whether that would even be enough to stop a fourth surge. I m worried about that surge. That 3 million doses is very hopeful, said Dr. Ashish Jha, dean of the Brown University School of Public Health. We are not going to have enough vaccine, with