Fauci Hoping 'Couple of Hundred Million' Vaccine Doses Available in 2021


"The answer is to be found in the human studies that will show how we respond to the vaccine", she said.

It is still not clear which vaccine will be effective. Each of the companies' vaccines are at various stages of development but have been deemed the most promising by the United States government.

Fauci also said Phase III trials for a vaccine candidate developed by Moderna are expected to start in early July and another candidate from AstraZeneca is proceeding on a similar track.

For coronaviruses causing the common cold, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said immunity nearly always lasts less than a year.

"I'm cautiously optimistic that with the multiple candidates we have with different platforms, that we are going to have a vaccine that will make it deployable", Fauci said.

"Maybe we've got some work to do to try to explain exactly once we have the data, why these vaccines are in fact proven to be safe and effective", he said.

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The companies on the list are the farthest along in developing a vaccine and have significant manufacturing capacity.

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Fauci added that he is more concerned about the durability of response than whether the vaccine will achieve a protective response.

Fauci, director of the National Institute of Allergy and Infectious Diseases, said in an interview with the Journal of the American Medical Association that production of the vaccine would be done as it remains in its testing phase. "That is one of the reasons for doing the experiments and research trials to find out", he said.

Whatever the number of shots, Collins gave his personal promise that it wouldn't be rushed through.

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.