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  • Senate passes resolution to repeal Biden's private sector vaccine mandate

    01:12
  • Dr. Anthony Fauci on omicron variant and effectiveness of boosters

    02:02
  • Pfizer study shows booster shot protects against Covid-19 omicron variant

    02:33
  • U.K. increases Covid restrictions to curb spread of omicron

    01:33
  • Thousands of service members miss Covid vaccination deadlines

    03:29
  • Pfizer CEO: New data about effectiveness of booster against omicron is ‘very good news’

    05:12
  • Pfizer releases new data about effectiveness of its booster against omicron

    01:53
  • Omicron infections now identified in over a third of the U.S.

    03:02
  • Demand for Covid vaccine increases as omicron variant spreads across U.S. 

    03:47
  • Violent clashes erupt in Europe amid renewed Covid restrictions

    01:49
  • As omicron spreads across US, officials balance new safety protocols

    02:20
  • Coronavirus: HHS national disaster medical team assisting overwhelmed New Mexico hospital

    02:50
  • Vaccine experts debate strategy of using current boosters against omicron

    02:55
  • Covid vaccine developer warns next pandemic could be worse

    00:56
  • New Covid testing rules come into effect for overseas travelers entering U.S.

    04:29
  • Omicron variant now reported in at least 16 states

    02:39
  • U.S. travel restrictions to go into effect as Omicron variant spreads

    02:11
  • Omicron variant is forcing Biden to put focus on COVID-19, Chuck Todd says

    02:09
  • Biden announces plans to combat omicron variant

    01:34
  • Omicron cases turn up in more states as international travel restrictions begin

    02:10

Watch: Full interview with Director of Wuhan National Biosafety Laboratory

29:12

The Director of Wuhan National Biosafety Laboratory, Yuan Zhiming, sat down for a far-reaching interview with NBC News' Janis Mackey Frayer about the origins of COVID-19, biosafety in Wuhan and the threat the pandemic poses to the world.