Coronavirus
Omicron Raises Vaccine Questions a Year After First Pfizer Shot
The world is waiting for answers about the new virus variant
Test tubes hold Covid-19 tests at a testing site in Los Angeles, California, U.S., on Dec. 6.
Photographer: Allison Zaucha/BloombergThis article is for subscribers only.
One year ago, a grandmother named Margaret Keenan, then 90 years old, rolled up her sleeve at University Hospital Coventry in the English midlands to take her place in history.
Keenan became the first person in the world to receive Pfizer Inc.’s Covid vaccine outside a clinical trial. It was a turning point in the pandemic, raising hopes that there was a path out of the crisis, along with questions about how well the rapidly-created shots would perform.