On Jun. 9, 2020, a Scripps research analysis of public datasets on asymptomatic infections, an extraordinary percentage of people infected by the virus behind the ongoing deadly COVID-19 pandemicﾗup to 45 percentﾗare people who never show symptoms of the disease.

The findings, published in Annals of Internal Medicine, suggested that asymptomatic infections may have played a significant role in the early and ongoing spread of COVID-19 and highlight the need for expansive testing and contact tracing to mitigate the pandemica