A new study found that approximately 90,000 lives lost to COVID-19 between June 2021 and September likely would have been saved with vaccinations.

Researchers at the Peterson Center on Healthcare and the Kaiser Family Foundation found that during that four month period, approximately 102,200 Americans died of the virus. Over 98,000 of them were unvaccinated. Using CDC data about vaccine effectiveness against death, the researchers estimated that 91% of those unvaccinated fatalities would have survived if they had gotten inoculated.

“The overwhelming majority of COVID-19 hospitalizations and deaths continue to be preventable,” the study concludes.

The study also found that COVID-19 was the leading cause of death among Americans ages 35 to 54 in September. Only heart disease killed more people across all age groups last month.

“COVID-19 killed more people age 25-34, 35-44, and 45-54 in August and in September than it did in any other month prior, despite the widespread availability of vaccines,” wrote the researchers.

In the first two months of 2021, COVID-19 was the most common reason of death in America.

Over 50 million adults in America remain unvaccinated.