[...] eight participants who received low and medium doses of Moderna’s vaccine had blood levels of virus-fighting antibodies that were similar or greater than those in recovered covid-19 patients. That suggests, but doesn’t prove, that it triggers some level of immunity.
Another 17 people had immune responses at a level similar or greater than recovered patients, but scientists had not yet tested whether their antibodies neutralized the virus.
[...]
Vaccine experts have said these accelerated development timelines are theoretically possible but extremely optimistic — and depend on everything going right. They stress that it will be crucial to gather convincing data that the vaccines are safe and effective before using them broadly — and the new data are promising but preliminary, from the earliest phase one trials that test safety in healthy people.
From the article:
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