COVID-19 mortality rates are going down, according to studies of two large hospital systems, partly thanks to improvements in treatment. Here, clinicians care for a patient in July at an El Centro, Calif., hospital.

EL CENTRO, CALIFORNIA – JULY 21: (EDITORIAL USE ONLY) Clinicians care for a COVID-19 patient in the Intensive Care Unit (ICU) at El Centro Regional Medical Center in hard-hit Imperial County on July 21, 2020 in El Centro, California. Imperial County currently suffers from the highest death rate and near-highest infection rate from COVID-19 in California. The rural county, which is 85 percent Latino, borders Mexico and Arizona and endures high poverty rates and air pollution while also being medically underserved. In California, Latinos make up about 39 percent of the population but account for 55 percent of confirmed coronavirus cases amid the pandemic. (Photo by Mario Tama/Getty Images)