The story of a scientist’s mea culpa on Covid-19 vaccines — and a rough week on Twitter

The development of Covid-19 vaccines is progressing at an unprecedented speed. Vaccines that were mere blueprints in January when the coronavirus began spreading globally already have advanced into massive Phase 3 clinical trials. The U.S. government wants hundreds of millions of doses of Covid-19 vaccine or multiple vaccines ready to distribute by January.

Many experts have raised concerns about this highly compressed development schedule. But this week, Steven Salzberg, a Johns Hopkins University professor and biomedical engineer, took the opposite tack. Writing in Forbes, Salzberg said that we should be reasonably confident already about the safety and efficacy of experimental Covid-19 vaccines and that we should start inoculating millions of Americans today.

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