Los Angeles Public Health Director Barbara Ferrer said that about 26 percent of cases confirmed between July 1 and July 16 were among people who were fully vaccinated against the virus.

But of those infected — called ‘breakthrough’ infections —  the symptoms were much less severe with less than 0.01 percent needing hospitalization.

That explains the new recommendations for people in virus hot spots to wear masks indoors, regardless of vaccination status.

“As more people are vaccinated, the number of fully vaccinated people becoming infected will increase and with the Delta variant that’s far more infectious, exposures to infections have also increased,” Ferrer said during the county Board of Supervisors meeting on Tuesday.