Dr. Michael Osterholm says new strains of COVID-19 have darkened his prognosis for the pandemic, which he is now scared could be “the big one.” Osterholm, a member of Biden’s COVID advisory board, discusses fixing the vaccine rollout problems.

Epidemiologist Dr. Michael Osterholm says new COVID-19 strains will likely cause cases to surge in March. Osterholm, who was on Biden's transition task force, says the U.S. needs to revise its vaccine and mask strategies now to save lives.