COVID-19 Most Transmissible 2 Days Before And 3 Days After Symptoms Appear

Each wave of the pandemic has underscored just how gravely contagious COVID-19 is, but there is less clarity among experts on exactly when—and to what extent—infected individuals are most likely to spread the virus.

Now, a new study co-led by a Boston University School of Public Health (BUSPH) researcher has found that...