RENO, Nev. (AP) — The first coronavirus antibody study conducted in Nevada suggests COVID-19 test results dramatically underestimate the number of people who actually have been infected by the disease.

The joint study by the Washoe County Health District and researchers at the University of Nevada, Reno concludes that four to five times more people have been infected with the virus that causes COVID-19 than have been formally confirmed as positive cases to date in the Reno-Sparks area.

Based on blood tests for antibodies, the June study indicates 2.3% of adults in Washoe County had an infection or exposure resulting in an immune response to the virus.