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  • UP NEXT

    Spread of Covid impacting start of classes for some schools across U.S.

    01:41
  • Health experts warn of new Omicron subvariants as winter approaches

    02:38
  • Biden administration plans to roll out new booster shots this fall

    00:21
  • How genetics, other factors can prevent Covid infections

    02:59
  • Dr. Ashish Jha on rising COVID-19 cases, masks, J&J vaccine

    04:52
  • How soon could the FDA approve Moderna shot for kids under 6?

    02:29
  • Full Dr. Jha: 'Vaccines are holding up really well against … all of the omicron variants'

    07:16
  • Fear, uncertainty and apathy: Covid infections rise but hospitalizations remain low

    01:02
  • The long-term effects of Covid

    03:29
  • Scientists working on universal vaccine to fight all future Covid variants

    04:40
  • What you need to know about rapid antigen tests and the omicron variant

    03:30
  • Dr. Paul Offit on how to go about holiday gatherings

    01:49
  • Another Covid Christmas: Deaths spike to highest level since last winter

    01:23
  • Dr. Fauci: VP Kamala Harris was 'taken a bit out of context'

    01:24
  • Dr. Fauci: 'When your time comes to get boosted, get boosted'

    01:32
  • CDC panel says people shouldn't get J&J vaccine if Pfizer, Moderna available

    07:07
  • New insight on transmissibility of omicron variant

    02:15
  • U.S. travel restrictions to go into effect as Omicron variant spreads

    02:11
  • A brighter future for rapid Covid tests?

    10:53
  • Answering your questions about the Omicron variant

    01:26

Facts over fear: How long will a Covid vaccine be effective and why cold storage is important

06:20

AstraZeneca said its Covid-19 vaccine could be up to 90 percent effective in preventing the disease — a third breakthrough in the fight against the pandemic. Dr. John Torres explains why AstraZeneca’s vaccine not needing cold storage is important, and how long a vaccine will likely keep recipients protected against the virus.