Single-dose vaccine tested as US experts say no corners cut

September 23, 2020
This September 2020 photo provided by Johnson & Johnson shows a single-dose COVID-19 vaccine being developed by the company. (Cheryl Gerber/Courtesy of Johnson & Johnson via AP)

WASHINGTON (AP) — A huge international study of a COVID-19 vaccine that aims to work with just one dose is getting underway as top U.S. health officials sought Wednesday to assure a skeptical Congress and public that they can trust any shots the government ultimately approves.

Hopes are high that answers about at least one of several candidates being tested in the U.S. could come by year’s end, maybe sooner.

“We feel cautiously optimistic that we will be able to have a safe and effective vaccine, although there is never a guarantee of that,” Dr. Anthony Fauci, infectious disease chief at the National Institutes of Health, told a Senate committee.

FDA Commissioner Stephen Hahn pledged that career scientists, not politicians, will decide whether any coronavirus vaccine meets clearly stated standards that it works and is safe.“Science will guide our decisions. FDA will not permit any pressure from anyone to change that,” Hahn said. “I will put the interest of the American people above anything else.”

As for the testing of vaccine candidates, Fauci added: “There is no cutting corners.”

A handful of vaccines already are in final testing in the U.S. and other countries, but the newest late-stage study by Johnson & Johnson aims to enroll 60,000 volunteers, one of the biggest so far, to prove if its single-dose approach is safe and protects against the coronavirus.

Other candidates in the U.S. require two shots.

Final-stage testing of one experimental vaccine, made by AstraZeneca, remains on hold in the U.S. as officials examine a safety question, although studies have resumed in other countries.

Even if the FDA were to allow emergency use of a vaccine by year’s end, supplies would be limited and given first to vulnerable groups such as health workers.

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