All California adults who received their original COVID-19 shots six months ago and think they would benefit from a booster should get one, California’s top health official Dr. Mark Ghaly said Wednesday. Speaking at a press conference in Los Angeles, Ghaly said that guidance is in line with the federal government’s eligibility rules for booster shots, which say anyone over 18 who got their vaccines at least six months ago and has an underlying medical condition or works or lives in a high-risk setting may get one.