Marin and seven other Bay Area counties issued orders this week requiring all people to wear masks in indoor public settings, regardless of vaccination status. The orders, which are consistent with guidance from the Centers for Disease Control and Prevention, also recommend that employers make face coverings available to individuals entering their businesses; all businesses are required to implement the order. Recent information from the C.D.C. indicates that fully vaccinated people can spread the Covid-19 Delta variant, which is substantially more transmissible than previous forms of the virus. As of July 25, all Covid cases in Marin were some form of the Delta variant. Of those cases, 93 percent that were sequenced were the “super” Delta variant. July 24 saw the largest spike in Covid cases since mid-January, with 57 new cases. Covid rates in unvaccinated residents remain higher, with 27.8 cases per 100,000 residents, compared to 8.8 cases per 100,000 vaccinated residents. Overall, there are an average of 13.7 cases a week in Marin as of July 30.