"We just do not want have a rapid uptick in cases; we are behind the 8 ball when that happens," said Centers for Disease Control and Prevention (CDC) Director Rochelle Walensky, MD, MPH, today during a White House briefing, as she urged Americans to remain vigilant against COVID-19 and avoid unnecessary travel in the coming weeks.The message came after a weekend of spring break revelry resulted in officials in Miami Beach declaring a state of emergency in response to a surge of maskless visitors, NPR reports.The city's mayor suspended outdoor dining after 7 pm and banned strolling on Ocean Drive after 8 pm."Now is not the time to travel," Walensky said. "We can look at the surge that happened in Europe, and we do not want that to happen