Erin Forsythe
Caption:	Virgina Mason advanced registered nurse practitioner Erin Forsythe loads a syringing with the Pfizer Covid-19 vaccine during a partnership with the hospital network and Amazon to increase the efficiency of vaccinations, at the Amazon Meeting Center in downtown Seattle, Washington on January 24, 2021.
Credit:	Grant Hindsley/AFP/Getty Images

Erin Forsythe
Caption: Virgina Mason advanced registered nurse practitioner Erin Forsythe loads a syringing with the Pfizer Covid-19 vaccine during a partnership with the hospital network and Amazon to increase the efficiency of vaccinations, at the Amazon Meeting Center in downtown Seattle, Washington on January 24, 2021.
Credit: Grant Hindsley/AFP/Getty Images

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New Covid-19 case counts are falling, but variants loom. So a vaccine maker is working on another booster

First, the good news: The rates of new Covid-19 cases are dropping in 48 states. And every state improved its rate of vaccinations.