SAN FRANCISCO (AP) — Counties in California and other places in the U.S. are trying to ensure they vaccinate people in largely Black, Latino and working-class communities that have borne the brunt of the coronavirus pandemic. San Francisco is reserving some vaccines for seniors in the two ZIP codes hit hardest by the pandemic. In Southern California, Riverside County has partnered with an immigrant advocacy group to vaccinate farmworkers. Nationwide, states are struggling to distribute vaccines equitably even as officials try to define what equity means. Officials are debating what risk factors gets someone to the head of the line: those in poverty, communities of color, the work they do or if they have a disability.