This summer is starting to look like last summer, at least where coronavirus is concerned. The county’s latest COVID-19 tracking report lists 521 new coronavirus cases Tuesday. That’s 136 more than the 385 new cases reported one year ago on July 20, 2020. After many weeks under 100 new cases per day, San Diego County has spent a week logging more than 400 new cases per day, according to the latest update from the county health department, with the local unadjusted case rate at 7.6 per 100,000, enough to put the region right back in the most-restrictive purple tier if the state’s reopening system had not been retired mid-June.