San Diego Braces for Steep Drop in J&J Vaccine Supply as State Preps for Eligibility Expansion The national supply of Johnson & Johnson doses has dropped 88% days before millions of more Californians will be newly eligible to receive a COVID-19 vaccine By Allie Raffa • Updated on April 11, 2021 at 7:21 pm NBC Universal, Inc. People rolling up their sleeves to get their COVID-19 vaccine at Cuyamaca College in El Cajon Sunday were relieved to get their one and only dose of the Johnson & Johnson shot before supply runs short. “We know what’s happening with the Johnson & Johnson vaccine so I had to make sure I got here today,” said David Johnson, a La Mesa resident who received his dose alongside his wife, Betty, after making their appointments last Sunday.