The Covid Virus Keeps Evolving. Why Haven't Vaccines?

On March 16, 2020, the first volunteer received a shot of Moderna’s then-experimental Covid-19 vaccine, just 63 days after the company had generated a genetic blueprint of the new virus. But Moderna’s rival beat it to the marketplace: Pfizer’s Covid vaccine would be authorized for use in the United States less than a year later, a record-breaking achievement. Previously, the fastest a vaccine had ever been developed was for mumps—which took about four years.

The speed at which both companies were able to deliver their vaccines can be credited to mRNA technology. Instead of using the virus itself to spur an immune response, as older vaccines do, scientists instead spur

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