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The C.D.C. now recommends that all adults get a booster. But only one in six Americans has received that shot, worrying health officials.
By Shawn Hubler and Amy Harmon
Science is unfolding in real time as researchers race to understand the new Omicron variant. Here’s a guide to those efforts, and when you can expect more answers.
By Amy Schoenfeld Walker and Lazaro Gamio
The main reason for the discrepancies is that state and county data does not always properly link the record of people’s booster shots to their initial vaccinations.
By Maggie Astor
Gov. Jared Polis signed an executive order declaring the entire state to be at high risk from exposure. He urged boosters for any adult who had enough time pass since the initial doses.
By Adeel Hassan, Daniel E. Slotnik, Amy Schoenfeld Walker and Josh Holder
This was featured in live coverage.
By Amy Schoenfeld Walker and Josh Holder
Vaccines still offer strong protection against severe Covid-19, but many studies show their protection against infection decreases over time. How much that decline matters is up for debate.
Data shows the vaccines kept working through the Delta surge, though some groups were at higher risk of breakthrough infections or death.
By Aliza Aufrichtig and Amy Schoenfeld Walker
By Audra D. S. Burch and Amy Schoenfeld Walker
Black Americans were once far less likely than white Americans to be vaccinated. But a wave of pro-vaccine campaigns and a surge of virus deaths have narrowed that gap, experts say.
An advisory panel is to vote later this week on whether to recommend emergency authorization of boosters for the Moderna and Johnson & Johnson vaccines.
By Sharon LaFraniere
