On Wednesday, after months of not getting a three week window of projections on vaccine supply, Los Angeles County Public Health Director Barbara Ferrer said, based on numbers received from the federal government, that Los Angeles will reach 80% vaccine coverage in residents over 16 years old the next 12 weeks. That means by the end of June the county should have achieved the overall the 70-85% immunity — through vaccinations and infections — Dr. Anthony Fauci says is required for herd immunity to the virus.

“If L.A. County receives 500,000 doses a week,” said Ferrer on Wednesday, “80% vaccination of 16 and over can happen in just 12 more weeks.”

According to U.S. Census data, 21.4% of Los Angeles County residents are under 18. Since all residents 16 and over will be eligible for vaccines on April 15, we’ll peg the percentage of those ineligible thereafter at 20%. In a county of 10 million, that equates to 2 million people. But many of those people have already been exposed to the virus.