Unvaccinated Americans are at risk of an aggressive and more dangerous Covid-19 variant. These are the most vulnerable states

Some states are making great strides in vaccinating their residents against Covid-19, but the ones that are not may soon be contending with a more transmissible variant, experts say. About 45.1% of the US population is fully vaccinated against Covid-19, CDC data showed, and in 16 states and Washington, DC, that proportion is up to half. But some states -- such as Alabama, Arkansas, Louisiana, Mississippi, Tennessee and Wyoming -- have fully vaccinated less than 35% of residents. More than 500 days and 600,000 deaths since the first person in the United States was reported to have died from Covid-19, experts have upheld vaccines as the key to reopening the country safely and containing the variants, many of which are more transmissible.