They fear that name may leave the impression that speed is more important than safety.
"I want to assure everybody who's heard the [words] "warp speed" and anxious that that means we're cutting corners on safety, that we absolutely will not do this", Collins said.
The US is planning massive clinical trials involving 100,000 to 150,000 volunteers in total, with the goal of delivering an effective vaccine by the end of this year.
But in some communities in the USA.
The study is set to primarily include U.S. sites, as well as some worldwide sites, with the individuals set to be enrolled in a controlled trial of Moderna's vaccine, mRNA-127.
Moderna also said that the vaccine was well-tolerated by the participants, although there were some case of moderate toxicity in the higher dose group (250mcg).
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He said AstraZeneca had also agreed terms with Serum Institute of India, the world's largest manufacturer of vaccines by volume, to supply one billion doses for low and middle-income countries.
As of June 2, the World Health Organization (WHO) listed 10 vaccine candidates under clinical evaluation, with 123 candidates in preclinical evaluation. "You got to be careful for them and you got to be careful that they may not spread it".
Fauci mentioned said Phase III trials for a vaccine candidate developed by Moderna are expected to start in early July.
"We can not comment on information that is market-moving", a U.S. Department of Health and Human Services official said.
In a live Q&A with the Journal of the American Medical Association, he said, "Then, by the beginning of 2021, we hope to have a couple hundred million doses".
A vaccine against the Coronavirus may not be as simple as one jab and you're immune.
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"Obviously that's not our favorite".
However, scientists aren't sure how durable people's immune response will be.
However, he emphasized that he is more concerned about the duration of the vaccine's response rather than if there will be any protective response. "That's one of the reasons to do the experiments and the research trials to find that out", he said.
A two-dose regime in treating COVID-19 across the country may demand more extensive coordination and record-keeping to ensure patients receive the full course of vaccination.
Whatever the number of shots, Collins personally promised that he would not rush.
Deliberately infecting humans with a pathogen of interest is normally "abhorrent", Caplan and Plotkin acknowledged, "but asking volunteers to take risks without pressure or coercion is not exploitation but benefitting from altruism", and extraordinary times, they said, sometimes require unconventional approaches.
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