Medicine’s Mark Cameron discusses new research on high prevalence of asymptomatic COVID-19 casesFebruary 25, 2022Media 0 More than 40% of people with COVID-19 never show symptoms, study finds. What experts have learned about these cases. USA Today: Mark Cameron, associate professor at the School of Medicine, discussed new research that analyzed more than 90 studies throughout the pandemic, finding that more than 40% of those diagnosed with COVID-19 were asymptomatic.