Vaccine makers racing to update COVID shots, just in case

Vaccine makers are racing to update their COVID-19 shots against the newest coronavirus threat even before it’s clear a change is needed, just in case. Experts doubt today’s shots will become useless but say it’s critical to see how fast companies could produce a reformulated dose and prove it works -- because whatever happens with omicron, this newest mutant won’t be the last. Omicron “is pulling the fire alarm. Whether it turns out to be a false alarm, it would be really good to know if we can actually do this -- get a new vaccine rolled out and be ready,” said immunologist E. John Wherry of the University of Pennsylvania.