Delta’s rise is fuelled by rampant spread from people who feel fine

Delta’s rise is fuelled by rampant spread from people who feel fine:

Cowling and his colleagues analysed exhaustive test data from 101 people in Guangdong who were infected with Delta between May and June this year, and data from those individuals’ close contacts. They found that, on average, people began having symptoms 5.8 days after infection with Delta — 1.8 days after they first tested positive for viral RNA. That left almost two days for individuals to shed viral RNA before they showed any sign of COVID-19.

And yet my school doesn't require masks.  Ugh.