US President Joe Biden has urged Americans to get jabbed, saying the unvaccinated "have a significantly higher risk of ending up in hospital, or even dying".
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"Almost everyone who has died from Covid-19 in the past many months has been unvaccinated," he told Americans on Tuesday.
About six in ten Americans are fully vaccinated, but in some states it's fewer than that.
What's the risk for unvaccinated people?
Case and death rates for people who are not vaccinated are higher in the US than for those fully vaccinated, according to data collected by the US Centers for Disease Control (CDC).
There are some breakthrough infections which result in death, but unvaccinated Americans have made up the majority of Covid deaths over the past few months.
The CDC found that an unvaccinated American is 14 times more likely to die from Covid-related complications than a fully vaccinated person.
This goes up to 20 times more likely, when compared with someone who has received a booster vaccination.
How many people are vaccinated?
More than 204 million people in the US are fully vaccinated, according to the CDC. That's about 61% of the population, with a further 12% partially vaccinated.
On top of this, about 62 million people have been given a booster jab.
However, in some US states, such as the north-western states of Wyoming and Idaho, fewer than 50% of the population are fully vaccinated.