IE 11 is not supported. For an optimal experience visit our site on another browser.

Dr. Peter Hotez answers everything you need to know about boosters

04:10

Dr. Peter Hotez joins Ali Velshi to answer all our questions about boosters, vaccine mix-n-match, and variants that may be waiting in the wings. “I’m holding my breath -- I’m still concerned about another big wave this winter,” warns Hotez. “We’re seeing a lot of complacency.”