The variant makes up 14.5% of California coronavirus cases analyzed so far in June, up from 4.7% in May, when it was the fourth-most identified variant in California, according to data released by the California Department of Public Health... Los Angeles County, the nation's most populous, has confirmed 123 Delta variant cases — 49 of them among residents of Palmdale and Lancaster. Fourteen cases of the Delta variant were in people from a single household. L.A. County data suggest that vaccines are still overwhelmingly effective in protecting people against the Delta variant, as well as other known variants. Of those 123 confirmed cases of the Delta variant in the county, 89% occurred among people who were not vaccinated against COVID-19, and 2% among those who were partially vaccinated.