Massive Survey From Italy’s Covid Epicenter: 74% of Infected Persons Under 60 Years Were Asympotmatic

With the study, some 5,484 contacts of SARS-CoV-2 index cases detected in Lombardy, Italy were reviewed, and the positive subjects were identified via nasal swabs and serological assays. It was found that 73.9 percent of the infected individuals (aged less than 60 years) did not develop symptoms, showing the proportion of the population who are asymptomatic.