On June 30, 2021, the Los Angeles County Department of Public Health (LADPH) reintroduced a strong recommendation that all residents wear face masks within indoor public spaces, even if they are vaccinated. The recommendation came only 15 days after California had lifted its remaining public health orders and mask mandate; officials stated that the recommendation was issued due to increasing spread of the highly-contagious Delta variant in the region, and due to the Department investigating reports of breakthrough infections in Israel that involved Delta variant.