The shot marks the first time an older, protein-based shot has been approved to fight Covid-19 and the first vaccine Novavax has been able to bring to market in its 34-year history.
Merck anticipates up to $7 billion in revenue from the drug through 2022, which it says can halve the risk of hospitalization and death in high-risk patients.
Republicans, Americans living in rural areas and white evangelical Christians are among the groups most likely to reject the Covid-19 vaccine, according to the Kaiser Family Foundation.
The agreement, one of the first to share a critical Covid-19 technology, would allow the drug to be made and sold cheaply in 105 low- and middle-income countries.
Two-thirds of Americans think many people in their country can’t afford good healthcare and just a quarter believe everybody gets the same standards of care, compared to global averages of 58% and 39%.