Here’s what we’ve learned – and how our understanding has evolved – since the earliest cases of the novel coronavirus were first reported.

Get the latest COVID-19 news, stories and information on the pandemic, vaccines and mandates around the San Francisco Bay Area and California.

Seventy-two severe cases of COVID-19 and 14 deaths related to the disease were confirmed last week, the highest weekly numbers this year, as hospital visits for COVID-19 also increased by 27.6 percent from the previous week,