Changes to CA vaccine distribution and tweaks to tier reopening Vaccination rates could factor into which tier a county is in Governor Newsom on Wednesday announced possible changes to the state's tiered reopening system. KTVU's Maureen Naylor reports on how vaccination rates could be a new factor. OAKLAND, Calif. - The state of California is making a change to its COVID-19 vaccine distribution. Wednesday evening, administration officials announced they will begin putting aside 40% of all vaccine doses for the "most vulnerable" communities. The plan is to distribute them across 400 zip codes based on a number of factors including household income, education and housing status.