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The Race for a Universal Covid Vaccine Heats Up

Mass Vaccination Center Reopens for Covid-19 Booster Shots
Photographer: Eugene Hoshiko/AP Photo

Hi, it’s Bob in New York. New Covid variants keep on emerging, so many that it’s hard to keep track. Is there one shot to protect against them all? But first...

Vaccine makers are racing to keep up with an ever-changing coronavirus. Moderna and Pfizer spent months testing mRNA vaccine boosters targeting the original omicron strain. But last week, after reviewing the data, US regulators instead advised them instead to develop boosters that would target the latest omicron strains, BA.4 and BA.5.