Slaoui said the US Food and Drug Administration (FDA) would likely grant approval in mid-December for distribution of the vaccine produced by Pfizer Inc and German partner BioNTech, launching the largest inoculation campaign in USA history.
"I'm just excited we now have three vaccines out there because when you're trying to immunize the entire planet we want to have as many different tools in our arsenal as possible", Adams said.
The U.K. Department of Health had no comment on Sunday on when the first vaccinations would be administered.
"If this all goes well in the next couple of weeks, then we are looking at the potential of starting the vaccination program next month for this Oxford-AstraZeneca vaccine as well as the Pfizer vaccine - but in all cases the bulk of the rollout will be in the New Year", Hancock told BBC Radio.
Moderna is expected to seek emergency use authorization from the FDA by the end of the month.
Dr Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases said the majority of the country must be vaccinated.
"Normally, with the level of efficacy we have, 95%, 70% or so of the population being immunized would allow for true herd immunity to take place", he said.
Mr Biden warned last week that "more people will die if we don't coordinate".
"So, if we get the overwhelming majority of people taking the vaccine, and you have on the one hand an effective vaccine, on the other hand, a high degree of uptake of the vaccine, we could start getting things back to relative normal as we get into the second and third quarter of the year, where people can start thinking about doing things that were too risky just months ago", Dr Fauci said. Both still need to be assessed by the United Kingdom health regulator before they can be administered to the public.
Experts have said that initially there won't be enough vaccine for everyone. Dr. Slaoui said health care workers, first responders, and the elderly are likely to be prioritized.
"Positive high-level results from an interim analysis of clinical trials of AZD1222 in the United Kingdom and Brazil showed the vaccine was highly effective in preventing COVID-19, the primary endpoint, and no hospitalisations or severe cases of the disease were reported in participants receiving the vaccine", the company says.
This photo provided by Pfizer shows part of a "freezer farm", a football field-sized facility for storing finished COVID-19 vaccines, under construction in Kalamazoo, Michigan.
Appearing on several network news shows on Sunday morning, Slaoui sketched out a timeline for getting the initial doses of the Pfizer vaccine from FDA authorization into the arms of those who will be first in line to receive it. The number of doses would vary depending on the need of each state.