BOLINAS, Calif.—Researchers began testing an entire town in northern California for the CCP (Chinese Communist Party) virus, commonly known as novel coronavirus, and its antibodies on April 20, one of the first such efforts since the pandemic hit the United States.

Medical professionals conduct tests for COVID-19 in Bolinas, where all residents are being tested for the CCP virus and its antibodies, in Bolinas, Calif., on April 20, 2020. Kate Munsch/Reuters