From the Introduction: "As of June 20th, 2020, the Center for Disease Control's tabulations show more than 2.2 million recorded cases of COVID-19 [coronavirus disease 2019] and nearly 120,000 in deaths in the U.S. Infected patients present with a wide range of symptoms, from completely asymptomatic to rapidly progressive pneumonia leading to death. Rigorous and widespread testing remains a critical component of strategies for containing this pandemic. The limited availability of molecular diagnostics constrains the use of these technologies to those who present with disease. [...] The net result is a continuing gap between widespread population level testing and the availability of tests, likely to persist for the foreseeable future. These circumstances motivate the development of complementary technologies for diagnosing and monitoring COVID-19 infections."
2020 American Association for the Advancement of Science
Science Advances: https://advances.sciencemag.org/