U.S. Surgeon General Dr. Vivek Murthy tells Stephanie Ruhle that the country could face a fourth wave in the pandemic depending on vaccination rates and whether Americans continue to take precautions like mask-wearing. He also explains how long covid-19 vaccines are effective and the idea of vaccine passports. Aired on 04/07/2021. » Subscribe to MSNBC: http://on.msnbc.com/SubscribeTomsnbc MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, Meet the Press Daily, The Beat with Ari Melber, Deadline: White House with Nicolle Wallace, Hardball, All In, Last Word, 11th Hour, and more. Connect with MSNBC Online Visit msnbc.com: http://on.msnbc.com/Readmsnbc Subscribe to MSNBC Newsletter: http://MSNBC.com/NewslettersYouTube Find MSNBC on Facebook: http://on.msnbc.com/Likemsnbc Follow MSNBC on Twitter: http://on.msnbc.com/Followmsnbc Follow MSNBC on Instagram: http://on.msnbc.com/Instamsnbc #Coronavirus #Vaccinated #MSNBC Surgeon General Warns Of Fourth Wave If Americans Don't Get Vaccinated, Take Precautions | MSNBC