July 28, 2020, 08.20 PM

“This is a significant milestone,” NIH Director Francis Collins said after the first test injection of Moderna's vaccine was given, at 6:45am in Savannah, Georgia.

“Yes, we’re going fast, but no, we are not going to compromise” on proving whether the vaccine is safe and effective.

“We are focusing on speed because every day matters,” added Stephane Bancel, CEO of Massachusetts-based Moderna.

After volunteers get two doses a month apart, scientists will closely track which group experiences more infections as they go about their daily routines, especially in areas where the virus is spreading unchecked.

The answer probably won’t come until November or December, cautioned Dr. Anthony Fauci, NIH’s infectious-diseases chief.

Among many questions the study may answer: How much protection does just one dose offer compared with the two scientists think are needed?

If it works, will it protect against severe disease or block infection entirely?

Don’t expect a vaccine as strong as the measles vaccine, which prevents about 97 percent of measles infections, Fauci said, adding he would be happy with a Covid-19 vaccine that’s 60 percent effective.

Several other vaccines made by China and by Britain’s Oxford University began smaller final-stage tests in Brazil and other hard-hit countries earlier this month.

But the US requires its own tests of any vaccine that might be used in the country.

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