Heart failure patients who are unvaccinated against SARS-CoV-2, the virus that causes COVID-19, are three times more likely to die if infected with the virus compared to fully boosted heart failure patients, according to new research out of Mount Sinai Heart. The study, published June 9 in the Journal of Cardiac Failure is the first to look at COVID-19 vaccination status and outcomes in patients with this cardiovascular condition, and shows how dramatic the protective effects are in this high-risk patient population.