President Biden vows to deliver 100 million doses of COVID-19 vaccine in 1st 100 days

One key factor could be the emergency authorization of the Johnson and Johnson vaccine, which only requires a single shot.
2:34 | 01/24/21

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Transcript for President Biden vows to deliver 100 million doses of COVID-19 vaccine in 1st 100 days
Now to the vaccine rollout with president Biden vowing to deliver 100 million doses in the first 100 days. A key factor could be emergency use authorization of the Johnson and Johnson vaccine, which unlike pfizer and modern, requires only a single shot. But that help could still be weeks away. Zohreen shah outside dodger stadium where cars are lining up. Reporter: Tonight, a two-day record -- nearly 3 million shots into arms, but states nationwide still struggling to meet the surging demand. New York running out of vaccines. The next shipment coming early next week. We have 7 million eligible people, okay? At 250,000 doses a week, this is going to take us 15, 16, 17 weeks. Reporter: Florida, California, and New Jersey also facing dwindling supply. I cannot be any clearer -- we have built the infrastructure vaccine that can handle this job. We need the doses. Reporter: Despite the virus raging in California, the state ranking near the bottom of the list in percent of available shots administered. L.a.'s mayor saying at the current pace, the county will not finish vaccinations until June of 2022 unless more companies hit the market. Dr. Anthony Fauci saying Johnson and Johnson's promising one-shot vaccine may be ready for emergency authorization in two weeks. You're going to see a sharp escalation of additional doses of this one-dose vaccine. Reporter: Eligibility requirements also adding to frustrations. New Mexico reversing course for teacher eligibility, leading to thousands of abrupt cancellations. The mood at our school went way down. They pulled a lot of hope, and there's a lot of frustration. Reporter: In Maryland, firefighter Steve Collins saying covid nearly killed him. Most horrific experience of my life. Reporter: Now begging colleagues to get vaccinated. I don't want what happened to me -- ugh. To happen to any of my brothers or sisters. Zohreen shah joins us from outside dodger stadium in Los Angeles. California having such a huge problem getting the vaccines out, and you're learning it could be a long time until everyone in the current eligibility group gets their shots? Reporter: Tom, you can see drivers behind me about to get vaccinated. The biggest issue here is supply. California officials say it could take until June until everyone 65 and over is vaccinated, and that pushes back vaccinations for everyone else. Tom? Zohreen shah from L.A. Zohreen, thank you. Now to former president

This transcript has been automatically generated and may not be 100% accurate.

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