Several northern, mostly rural states that are battling coronavirus surges with few mask mandates and low vaccine rates are now leading the nation on another preventive front: booster shots.
The rate at which fully vaccinated residents are getting the shots is highest in the states that also have high rates of new coronavirus cases, including Alaska, North Dakota and Montana, according to a review of state data by The Washington Post. In swaths of the country where health officials will not impose mask and vaccine mandates to curb the virus's spread, or have had their powers stripped away by Republican state lawmakers or governors, boosters are one of the few shields left for those worried about contracting and spreading the virus.
"It's really become impossible for local public health authorities to implement any sort of social distancing measures that could help slow down the spread," said Matt Kelley, CEO of the Montana Public Health Institute. "Getting that booster shot is one of the few tangible things that you can do to protect yourself."
Just over half of Montana's population has been fully vaccinated, ranking 35th in the nation, but nearly 1 in 5 of vaccinated Montanans received boosters, ranking second in the nation.
Montana is among a dozen states leading the nation in both infections and booster rates: Vermont, Idaho, Iowa, Wisconsin, Minnesota, Wyoming, Michigan, Colorado, Alaska, New Mexico and North Dakota. Most of those states also have had overall low vaccination rates. Vermont is an outlier with the nation's highest vaccination rate and booster rate.
Several states that successfully vaccinated the vast majority of their population - including New York, California, New Jersey and the District - have since seen a lull in new cases and a smaller share of immunized residents getting a booster. Booster rates are also low in poorly vaccinated states where infections have calmed, such as Georgia, Texas, Mississippi and North Carolina. That has worried some public health authorities.
"I think it's an unfortunate human response to not take action until it's closer to you, but the idea behind vaccines and public health is to take action now before the holidays and before winter comes," said California State Epidemiologist Erica Pan, who is urging residents of her state - where more than 6 in 10 residents are vaccinated - to not wait for their state's case numbers to rise to get their booster. She noted first and second dose vaccines picked up during the summer surge, and she suspects the state may follow a similar pattern with boosters as hospitalizations creep up, particularly in the Inland Empire.

Some low-infection states with high booster rates such as Tennessee and Kentucky are just emerging from late-summer surges of the highly contagious delta variant.